Using the Home-School-Community Model to Enhance the Chinese Language Proficiency of Non-Chinese Speaking Children

This study employed a mixed-method approach from 
multiple source of informants, including NCS students, parents, principals, 
teachers, multicultural teaching assistants (MTAs), and voluntary agencies to 
validate the effectiveness of using the Home-School-Community 
(H-S-C) framework in teaching Chinese to non-Chinese-speaking (NCS) 
children. Results revealed that NCS students receiving the H-S-C-based 
interventions showed a better Chinese language proficiency progression than the 
comparison group. Within the home domain, NCS parents increased awareness, 
knowledge and skills in supporting children’s learning, and provided improved 
space for learning Chinese at home. In the school domain, principals and 
teachers were equipped with culturally-responsive pedagogical knowledge and 
skills in teaching NCS students, with MTAs’ assisting in teaching and 
communicating with parents and teachers. Community domain programs provided 
experiential learning opportunities for NCS students to know the community and 
engage in cultural exchange with local students. With a holistic approach to 
home-school-community domains, a reconstruction of an L1-like Chinese language 
learning environment was made possible for NCS students.


Introduction
Finding effective ways to help minority-language populations learn a second language in their host countries and communities has been discussed in different studies (Legault et al., 2019;Choi & Ziegler, 2015). In 2016, the number of ethnic minorities (EM) in Hong Kong constituted 3.6% of the whole population (excluding foreign domestic helpers), with the figure on a rising trend. To integrate into a society where Chinese (spoken in Cantonese and written in traditional characters) is the predominant language, having a sufficient level of Chinese proficiency is obviously crucial; however, non-Chinese speaking (NCS) students have consistently reported great difficulties in learning Chinese, lagging behind in Chinese language proficiency when compared with the local Chinese-speaking (CS) students at the same age or grade level (Equal Opportunity Commission (EOC), 2019). In current general practice, Chinese, a predominant language in the local context, is not separately taught as a subject under the local kindergarten curriculum in the government-subsidized kindergartens (Curriculum Development Council, 2006). Instead, Chinese is taught across curriculum. As kindergartens usually adopt theme-based integrated approach, preschoolers learn Chinese through activities under different themes. As a result, establishing a model that can assist NCS students to learn Chinese effectively is a main concern for many early childhood educators. In the following, the present situation of NCS students in learning Chinese will be first examined. Next, a project using a home-school-community framework to address the issues encountered by NCS students in learning Chinese will be introduced with literature review on the theoretical underpinnings on how the three domains are associated with children's learning. Then, different evaluations under the project for the contribution of Chinese language learning development in local NCS kindergarteners will be presented. Finally, implications generated from the evaluation findings on successful Chinese learning of NCS students will be discussed.

Issues Encountered by NCS Students in Learning Chinese
The difficulties NCS students faced in learning Chinese can be understood in several aspects. First of all, as Chinese is a language of logographic writing system without the grapheme-phoneme correspondence (Chen et al., 2009), learning the language may be difficult for NCS students. In terms of writing Chinese characters, which is the basic complete unit in written form, emphasis is on both the stroke order and radical or component combination. Given the features of the Chinese language, it would be cognitively demanding for NCS students to learn the language well.
Secondly, there is a lack of language environment support for NCS students. NCS students do not systematically learn Chinese at kindergarten until the language is taught as a subject beginning from Primary 1 in the local mainstream primary education (Curriculum Development Council, 1996) and they are not encouraged to use the locally predominant language outside school. They usually live in communities clustered with people of the same race (EOC, 2019), and most of their parents do not provide an environment that is favorable in learning or using Chinese in their children's recreational time (Tsung & Gao, 2012). The strong attachment to their own culture and the isolation of themselves from the mainstream Chinese culture has limited NCS students' opportunities for fostering their ability in the Chinese language.
Thirdly, learning materials and teacher quality are also factors that hinder the Chinese learning of NCS students. Currently, learning and teaching materials used in the local mainstream kindergartens are designed to target local Chinese-speaking children without considering the Chinese language ability of NCS students (EOC, 2019). Kindergarten teachers in the local mainstream system have no training on teaching NCS students (EOC, 2019). They have limited knowledge of the culture and language of the EM students, hindering the smooth communication between teachers and NCS parents in terms of understanding the learning progress of NCS students at school and their learning support needs at home.

Hong Kong Government Assistance to NCS Students
In 2016, the school attendance rate of NCS students at age group 3 -5 was 90.7% (Census and Statistics Department, 2017). In recent years, the Hong Kong government has emphasized NCS children's learning of the Chinese language to begin as early as kindergarten schooling in the local early childhood education curriculum. However, the existing support measures are not enough for NCS students to catch up with the local curriculum, which is planned in accordance with the Chinese language abilities of children who speak Chinese as the first language. Despite a series of support measures for NCS students in primary and secondary schools, similar support measures have yet to cover kindergartens. Although kindergartens having NCS students' intake could use the extra subsidy to hire teaching staff (Government of HKSAR, 2016), most of these recruited staff have not been equipped with pedagogical knowledge and skills to teach and take care of NCS students. Regarding home-school cooperation in Hong Kong, the establishment of Parent-teacher Associations (PTAs) at school level has been promoted, for over 30 years, for better communication between home and school and to encourage parents to take a more active role in school decisions. However, PTAs only exist in one-third of the kindergartens, with some mentioning the problem of a language barrier that is hindering the communication between parents of NCS students, their teachers and Chinese parents. Responses to the needs of NCS parents and parent education, and facilitation of the establishment of PTAs in kindergartens have been stressed (Task Force on Home School Co-operation and Parent Education, 2019).

C-for-Chinese@JC Project
In view of the above, The Hong Kong Jockey Club Charities Trust has initiated the C-for-Chinese@JC project with the goal to enhance Chinese language learning for local NCS students at the kindergarten level, with a holistic model comprising three sectors: school, home, and community, which is the first of its kind to introduce a conceptual framework for NCS kindergarteners to learn Chinese Under the three domains of school, home, and community are a range of inputs, services and programs function of the intervention programs of the project, directly or indirectly, for supporting NCS preschoolers to learn Chinese. In the school domain, it is divided into educators' professional development, and learning and teaching, with the former focusing on knowledge and skill enhancement of educators and professionals, and the latter emphasizing on pedagogical and curriculum support as well as assessment. The home domain includes various trainings targeting NCS parents' facilitation for their children's learning of the Chinese language. The community domain branches into community and social support and e-learning development; the former is about the provision of activities and services and the latter is about center-based learning and service delivery learning mode.

Literature Review of Home-School-Community Framework
Home-school-community (H-S-C) collaboration has been found to be imperative for students to grow up with academic, emotional, and social success (Henderson & Mapp, 2002;Pomerantz et al., 2007;Sheldon, 2007). As stated by Epstein (1994), the term "school, family, and community partnerships" expresses "the shared interests, responsibilities, investments, and the overlapping influences of family, school, and community for the education and development of children they share across the school years" (p. 39) and it allows different stakeholders (parents, teachers, principals, community organizations and local leaders) to work together for the betterment of the children's academic pursuit on the ground that the life success of the children also means the better future of the community and of the family.  Theory (1993), which explains that the child is in the center of different settings and influenced by five levels of systems. The first level is the microsystem which contains the child's direct contacts, such as family members, friends, neighbors, and teachers. The face-to-face interactions with people in home, school, and community make a strong influence on the child's growth and development. The next system is the mesosystem which is related to the microsystem in that it includes the influences of all the relationships existing in the microsystem. For instance, the child's relationship with friends may affect his/her home and school life. The third level is the exosystem in which the child is influenced by non-direct contacts. The requirement to work for long hours leads to less time for parents to spend with the child, for example. The fourth level is the macrosystem which is the larger societal influence of cultural beliefs and values. The fifth level is the chronosystem in which the child is influenced by the time of his or her generation. As all the levels of influence are reciprocal with different contexts influencing one another (Weiss et al., 2005), the "C-for-Chinese@JC" project emphasizes the combination and interaction of efforts from home, school and community for local NCS kindergarteners' achievement in Chinese language learning.

School Domain
The school level involves all the aspects in the school system, such as educational materials, school policy, school physical environment and social climate, and teacher quality. In the study done by Kamps et al. (2003), students studying on a reading mastery curriculum had better results in reading fluency than those learning with a literature-based curriculum. That said, educational materials always play an important role for students' success. Viewing this, designing suitable learning materials for EM students is important. Currently, in Hong Kong, the NCS students are taught together with the CS children. However, most NCS students have lower Chinese language proficiencies than their CS counterparts.
Having students with different learning abilities in the same classroom requires a differentiation of instruction apart from good materials. In teaching, "differentiation is defined as working to address the abilities, interests, and needs (both perceived and real) of individuals. Differentiation provides students with opportunities to approach curriculum from their strengths, as varied as these might be" (Sondergeld & Schultz, 2008: p. 35). When teachers adjust the teaching content, process, questioning and evaluation methods, as well as the learning environment in accordance with students' ability and interest, children can maximize their learning effectiveness (Tomlinson, 2000).
Moreover, teacher quality is of prime importance to students' learning.
Teacher-student relationships affect students' connectedness to schools (Patrick et al., 2000) as well as their learning interest. However, teachers expressed inadequate knowledge on how to work with diverse groups of students and there This project attempts to narrow the NCS students' proficiency gap in Chinese language learning by enhancing teachers' professional awareness, knowledge and skills, and culturally responsive (CR) pedagogies aligning with the development of differentiated learning materials for kindergartens developed by the project.
In addition to the differentiated learning materials, teachers also apply differentiated pedagogies. During class, teachers would adjust the teaching process, way of questioning, and assessments between CS and NCS students to address their different learning needs and abilities.

Home Domain
Parental involvement has been found to be positively associated with children's school performance (Sheldon & Epstein, 2005;Jeynes, 2005). Regarding students' literacy performance, studies have revealed that interventions involving parents enhanced children's interest and duration for reading than those without parent involvement (Morrow & Young, 1997); moreover, research shows that when young children were provided with stimulating reading and writing activities at home, they had better early literacy and oral language skills which are vital to their future academic pursuit (Purcell-Gates, 1988;Whitehurst & Lonigan, 1998). According to Sheldon (2003), effective home-school collaboration was significantly associated with higher percentages of students who scored satisfactory or above in reading. Therefore, engaging parents into school affairs has a great impact on children. Epstein (1994) identified that the spheres of family, school, and community do not exist as individual spheres but overlapping with one another to influence a child's education, and developed a "family-school partnership framework" (Epstein, 2001) including six types of parent involvement: parenting (i.e. help families with parenting skills for supporting the child's academic growth); communicating (i.e. ensure a two-way communication exists between home and school about school programs and the child's academic progress); volunteering (i.e. recruit, train, and schedule family volunteers, and support for their work with both school and child); learning at home (i.e. promote family involvement with the child's studies such as homework, and develop interactive home activities for the child and family members); decision-making (i.e. offer opportunities for family to participate in school decision making); collaborating with the community (i.e. coordinate community resources and services for the child, family and school through social services providers and higher education institutions). The framework of parent involvement has mobilized the support from home, school, and community to contribute to the success of the child's educa- This causes difficulties in their communication with schools and also in their monitoring of children's learning progress. Therefore, assistance to parents' learning of Chinese language is essential to equip well the NCS families, both parents and children, to be more adapted to the education system in Hong Kong.

Community Domain
By adding "community" to the home-school partnership, it recognizes the resources available within the community that could benefit children and families in the educational process. As stated by Suarez-Orozco et al. (2010), "the goals of students cannot be divorced from the goals of the community, and schools and community agencies will both be more successful if their efforts are joined" (p. 23). Families have access to the community resources, such as child care, medical care, and academic assistance, freeing families to more involvement in educational-related activities which promote their children's academic progress. For the contribution to students' educational success, it is vital to connect school with community.
Since language barriers and cultural values may prevent parents from involving in their children's education, Grant and Ray (2019) have stated that to effectively support parent involvement, it is important for schools to have partnership with community agencies that are familiar with or are already working with specific populations. By providing programs which help minority language parents support their children's learning of the majority language, these parents come to understand their vital role and are given an opportunity to encourage their children's learning. With appropriate parent programs, families may reinforce a positive attitude toward learning the majority language at home (Clayton, 2003).
NCS families in Hong Kong are usually partitioned from the Chinese community so the NCS parents and children are exposed to an environment less favorable to acquire Chinese language. Hence, it is important to bridge NCS students' in-school and after-school learning experiences. A series of intervention programs has been designed and implemented in the three domains of school, home and community holistically as detailed below.

School Domain Interventions
Storybook differentiated learning and teaching materials. A series of storybooks graded into three levels for kindergarten one to three (K.1 to K.3) is developed.
These differentiated materials, aiming to address the diversity of NCS students that hinders their learning of Chinese, allow flexibility for teachers' adoption based on different class and school contexts.
Multicultural Teaching Assistants (MTAs). MTAs are trained to support the School-based support. School development officers from the university provide intensive support for kindergarten teachers and MTAs, working collaboratively in designing lesson plans and designing curriculum incorporating CR pedagogies into the school curriculum on a regular basis with class observation and feedback on teaching.
Principal and teacher professional development. A course is designed for both principals and teachers to equip them with knowledge and skills for applying inclusive education to address the needs of NCS kindergarten children.

Home Domain Interventions
Parent-led home activities. NCS parents join group workshops to learn basic Cantonese and prompting skills prior to the parent-led home activities, then they can interact with their children in Cantonese at home. In addition, tailor-made learning goals and methods are discussed between social workers and parents. There are also follow-up meetings to review the progress, as well as group meetings for experience sharing.
Parent Chinese class. Chinese classes are provided for NCS parents to advance their use of the Chinese language. The content of parent Chinese class is based on the differentiated story-book teaching materials, which aligns the parents with similar curriculum content that their children are learning at the same time.
Parent support group. The parent support group aims to nurture NCS parents' role in enhancing their children's Chinese learning at home. Topics relevant to NCS students' mainstream schooling in Hong Kong are introduced, such as the local educational system and curriculum adopted by kindergartens. Parents having difficulties attending the workshops are provided with online materials by NGOs to facilitate self-learning.
Parent workshop. The parent workshop creates a platform for NCS parents to meet with Chinese parents for on-going mutual support as a parent community as well as useful information exchange among parents.

Community Domain Interventions
Community exploratory activities. These community activities are conducted in the surrounding spots near NCS students' living places, i.e. a nearby post office or some Hong Kong landmarks such as the Science Museum. CS volunteers recruited interact with NCS students in Cantonese and that makes the children practise Chinese more in activities. The activities also help NCS students build up a network in their own living community while knowing the city broadly.
Cross-cultural activities. These activities are organized to facilitate cultural exchange between NCS and CS kindergarteners and their parents through One to One mentorship scheme. Chinese-speaking volunteers are trained to give regular one-on-one support to NCS children at their home or in a safe nearby area. The scheme aims to cultivate the interest and boost the confidence of NCS students in learning Chinese through games and activities.
Chinese language centre. The Chinese Language Discovery Centre is a play-based and outside-classroom learning centre, providing children with support of reading and writing development, media exploration, and simulation of real-life experience with drama, toys, and puzzles.

Present Study
This paper aims to: 1) validate the using of H-S-C framework in supporting of Chinese language acquisition in NCS kindergarteners 2) assess the program effectiveness in home, school, community domains In order to have a comprehensive understanding of the effectiveness of the H-S-C framework on students' Chinese learning, this study has employed the mixed methods approach with different evaluation methods, including the objective outcome evaluation, case study, subjective outcome evaluation, and governmental document review, from multiple sources of informants. As stated by Denzin (2012), making use of "multiple methodological practices, empirical materials, perspectives, and observers in a single study is best understood as a strategy that adds rigor, breadth complexity, richness, and depth to any inquiry" (p. 82). Written consents were obtained from all participants who have joined the "C-for-Chinese@JC" project, including students, parents, teachers, and school principals before data collection. In the following, different evaluations used in different intervention domains and the related results will be presented.

Instruments
Participants' Chinese language ability was assessed by the Chinese Language Learning Progression Framework for Non-Chinese Speaking Children in Kindergartens in Hong Kong (LPF) (Lam, Hui, & Cheung, 2018)  Taken into account the theories of first and second language development of young children, effective pedagogy of second language teaching, and second language assessment around the world, and development of LPF has undergone rigorous procedures including expert group discussion, focus group discussion, and a pilot program before the confirmation of the present version of LPF (Lam et al., 2018).
Each assessment contains of two papers. Paper I assesses students' listening and speaking abilities. For listening domain, NCS students' understanding of verbal commands, questions, descriptive content, and informational content are evaluated; and for the speaking domain, students' verbal abilities in answering questions, describing personal experience, providing information, making enquiries or requests, and expressing views or feelings are tested. Paper II assesses students' reading ability-how well they can recognize Chinese characters or components, read aloud text, retell text, link text with daily life experience, and understand of common daily used words. After the tests, students will obtain marks for different tests according to their performance. An overall score indicating the students' Chinese language proficiency is computed by adding up the scores of the three domains.  As seen in Figure 2, three Welch t-tests revealed that the experimental group had a significantly higher overall LPF score at the K1 post-test when compared    All 88 NCS students of the 2016-17 intake received intervention of the Project programs under the H-S-C framework through the whole stage of kindergarten education from K1 to K3. The above improving LPF assessment pre-and post-test scores over three years show that intervention programs of the Project have enhanced the Chinese language proficiency of the students effectively, with the greatest improvement observed during their K3 studies. Students receiving the intervention also performed statistically better at the K1, K2, and K3 post-tests compared to those who did not, meaning that the H-S-C framework overall is effective at improving the Chinese language proficiency of NCS kindergarten students.
In order to uncover the possible factors that could explain the performance difference between HGS and LGS students, case studies were conducted at two time points: at the beginning and the end of the 2017-18 school year. In the present study, we only assess how participation rate in the programs under the H-S-C framework contributes to the improvements in NCS kindergarten students' Chinese language proficiency.

Analysis
Mean participation rates of HGS and LGS students in all programs under the H-S-C framework were computed and then compared to uncover if there were any visible differences between the two groups ( Table 1, Table 2).  Home Domain.

Results
Five out of ten students and their parents of the HGS group participated in the Parent-led Home programme and had a mean Parent Support Group attendance of 6.8 times over a school year, with 6 parents participating at least 3 times. In contrast, none of the ten students and parents in the LGS group participated in the Parent-led Home programme and had a mean Parent Support Group attendance of 0.6 times over the same period, with 8 parents not participating in the group at all. It indicates that parents of the HGS group participated more in both programs supporting them in relation to effective Chinese learning. Although the mean attendance of the Parent workshop did not differ as drastically, it is worth noting that half of the parents in the HGS group participated at least once, compared to only one parent in the LGS group participating twice, with the others not participating at all.
The results from the home domain programmes suggested that participation in the Parent-led Home programme and the Parent support group may be linked to greater improvements in Chinese language proficiency for NCS students.
School Domain.
Students in the HGS group had an average storybook instructional time of 971.5 minutes over a school year, compared to only 615 of the LGS group. Also, eight out of ten students in the HGS group were taught using differentiated storybooks learning materials, compared to only one out of ten in the LGS group.
The results suggested that both storybook instructional time and the use of differentiated storybooks materials contribute to greater improvements in Chinese language proficiency for NCS students.
Community Domain.
The mean number of community activity sessions participated by students in The results suggested that participation in community and cross-cultural activities may contribute to greater improvements in Chinese language proficiency for NCS students.

Government Quality Assurance Document Review Relating to Schools with NCS Students
Quality Assurance in Local Government Subsidized Kindergartens

Results
To support NCS children, seeking external support for NCS children is in the right direction (Kindergarten Inspection Section, 2017c). With this respect, the "C-for-Chinese@JC" project has adopted the H-S-C framework which caters for the diverse needs of NCS children in different aspects. Moreover, the project also

Analysis
Questionnaires were analyzed to see if NCS parents considered the different programs to be effective in building their capacity in supporting their children's learning Chinese. Comments from open-ended questions were grouped according to recurring themes.

Results
Parent Chinese Class. Table 3 suggested that the Parent Chinese Class achieved its aim of equipping NCS parents with basic Chinese language skills. All parents agreed that the classes were organized in a way that helped them do so, and they felt that their Chinese proficiency is better, with increased confidence in speaking and listening to Chinese. The classes also inspired them to pursue further learning in Chinese. Practically speaking, all parents were able to use Chinese at least once a day, both on their own and with their children, with more than 40% using Chinese with their children more than once a day.

Results in
Open-ended comments revealed that parents found the course useful. They stated that the best of the course was "getting to know more people". Undoubtedly, helping parents build their own networks of friends is fundamentally essential for facilitating smooth social integration by engaging them in different aspects of daily living.
Parents had positive comments on the course materials and the course teachers. They regarded the teachers as very good and friendly. They also appreciated on the "teaching method", which includes the teachers' practice on "reviewing (what they had learnt)" before starting each lesson, and their patience in "repeating all things once again" in the course. Parents clearly stated that the course had been useful to them in their daily lives not only in helping them teach children but also being good for their future as well as the course would "do a lot in (her) future", as supported by one parent, it is "real survival Cantonese that I can use right away in daily life". The best thing about the course stated by another parent was "(having) fun games that never let me (her) sleep during the classes". Parents wished that the course could be continued with less non-Chinese speaking time "(for) English, Korean or Urdu …" during the course, as elaborated by one parent, "we don't have to understand every word and a lot of Cantonese input will help us in the future." Parent Support Group.
All parents thought that the Parent Support Group was able to facilitate them in helping their children learn Chinese. Of the parents who responded, all thought that they gained more knowledge and skills in supporting their children in learning Chinese, and that the group raised their awareness towards supporting their children in learning Chinese. No comments were given in the open-ended questions (Table 4).

Results
There were 90.32% principals and teachers considering the school leadership workshop to be useful in their daily school practices. Teachers mentioned that the workshop deepened their Chinese knowledge, and also increased their understanding towards NCS parents and families in Hong Kong.
The majority of principals and teachers (90%) considered the teacher professional training program useful for them in supporting NCS students in learning Chinese at school. In particular, most comments mentioned their appreciation towards the inclusion of a cultural element in the program. Teachers had a better understanding about NCS cultures and religions, and better understood NCS students' Chinese proficiency levels along with how to adjust their teaching methods and expectations accordingly after participating in the program and were reminded of the importance of being culturally responsive. Strongly Disagree (%) Disagree (%) Agree (%) Strongly Agree (%) The group was organized in a way that helps me achieve its outcome 0 0 21.1 78.9 I gained more knowledge and skills in supporting my kids to learn Chinese 0 0 17.5 15.8 My awareness of supporting my kids to learn Chinese is raised 0 0 12.3 12.3

Participants and Procedures
In the 2017-18 school year, 24 MTAs were invited to fill in a Student Evaluation of Teaching and Learning (SETL) questionnaire; and 18 principals and 74 teachers were invited to fill in a semi-structured questionnaire.
The SETL questionnaire measures the effectiveness of the course in facilitating learning of students, and the teaching effectiveness of the course implementers on a 4-item scale (strongly agree, agree, disagree, and strongly disagree). Open-ended questions are included at the end for further elaboration. The questionnaire was developed by The University of Hong Kong and has proven reliability and validity (The University of Hong Kong, 2012).
Principals and teachers were asked to rate their satisfaction toward MTAs' performance on a four scale (very unsatisfied, unsatisfied, satisfied, and very satisfied).

Analysis
Percentage distributions were generated for each statement of the MTA SETL questionnaire to compare the proportion of MTAs that consider the training course effective versus those who do not. The results from the principal and teacher questionnaire were then used to verify whether they also consider the MTA training course to be effective. Open-ended questions from both questionnaires were categorized according to recurring themes.

Results
As shown in Table 5, all MTAs understood the expectations and content of the course, and found the course organisation helpful and effective in allowing them to achieve the learning outcomes. They also agreed that the course inspired them to pursue further learning in the subject and in related skills. Moreover, all MTAs provided positive feedback to the teachers. They agreed that the teachers helped them understand key concepts, ideas and issues addressed in the course, and were intellectually stimulated. They also agreed that the teachers were supportive and provided opportunities for students to interact and collaborate.
The open-ended comments given by MTAs showed that they appreciated the practicum of the course and they also found the course fruitful in terms of course design. Many MTAs appreciated the fun teaching approach of teachers, and thought that the teachers were patient, helpful and encouraging. They also enjoyed learning teaching techniques from the course.  Regarding the feedback from principals' and teachers' questionnaire, 81.5% of principals and teachers were satisfied with the overall performance of MTAs, with only 5.4% unsatisfied, expecting MTAs to be more proactive and involved in lesson preparation and teaching activities.

Participants and Procedures
Questionnaires were distributed to all project participating schools to collect their views toward the differentiated learning materials for the 2017-18 school year, finally 18 principals and 74 teachers responded to the questionnaire.

Instruments
A semi-structured questionnaire asking respondents satisfaction level in four areas of the learning materials: compatibility with existing curricula, compatibility with abilities of students, attractiveness of materials to students, and cultural responsiveness of materials. Open-ended questions are included at the end for additional elaboration.

Analysis
Percentages of each statement on the questionnaire is calculated and compared to determine if principals and teachers found the differentiated learning materials performing well in the four areas.
Results Table 6 shows that most principals and teachers were satisfied with the differentiated learning materials, in terms of compatibility with the existing curricula (80.4%), compatibility with students' abilities (85.3%), appealing to students (88.6%), and culturally responsiveness (90.2%). One principal commented that the materials suited their kindergarten's themes, and that teachers were able to apply cultural responsiveness in their teaching, which was reflected in pleasurable and integrated learning of NCS and CS students. One teacher commented that the materials were relatable to daily life.

Results
Over half of the principals and teachers (65.2%) were satisfied with the effectiveness of both community exploratory activities and cross-cultural activities, with only 7.6% unsatisfied for community activities and 5.4% unsatisfied for cross-cultural activities. One principal and a few teachers commented that the activities allowed NCS students to gain new life experiences and knowledge, based on their previous knowledge. One principal and another teacher also mentioned that the activities were pleasurable for the students.

Discussion
Overall, results indicate that using interventions under the H-S-C framework was successful in improving the Chinese language proficiency of NCS students, as evidenced by the longitudinal study which showed increasing Language Proficiency Framework scores from K1 to K3. At any given time-point during this period, NCS students receiving H-S-C framework-related interventions also performed better than those who did not, meaning that the framework-related interventions were more effective compared to current approaches for learning and teaching of Chinese for NCS students. The successful of the H-S-C framework was further confirmed by the case study on "top ten" students' performance as well as the Quality Assurance reports from the Hong Kong government.
The effects of all the inputs within the three domains culminate in the overall improvement in Chinese language proficiency and better social integration observed in the experimental group of NCS students in this study. The capacity building of NCS parents, principals, teachers, and MTAs in supporting NCS students' learning Chinese, and the development of appropriate differentiated learning materials and community programs, together serve the common purpose of recreating L1-like language learning environments for NCS students.
This hinges on home, school, and community domains playing their respective roles.
Within the home domain, the study was the first of its kind in systematically building the capacity of NCS parents in supporting their children to learn Chinese as a second language, in the areas of parent awareness, parent Chinese language proficiency, knowledge of community resources, schooling information, and parenting skills. All home domain activities were well-received by parents and after these activities, parents were more confident in using Chinese, and they all agreed that they were better equipped to support their children in learning Chinese. Evidence in the school domain interventions also points to the success in capacity building of principals and teachers. Firstly, the professional training programs were thought to equip educators with practical skills of effective teaching methods and enhance the awareness of the cultural diversity of NCS students. Secondly, MTA, a post created to assist NCS students in learning Chinese in the school environment, was perceived by principals and teachers as helpful in delivering CR teaching and learning in classes, as well as being the communication bridge between schools and NCS parents. MTAs also thought themselves being able to perform the intended roles in the classrooms and they were being equipped with professional skills. Thirdly, the development of differentiated teaching materials, was able to cater to diverse language abilities and cultural backgrounds of NCS and CS students. The teaching materials were attractive to facilitate students' learning, and being culturally appropriate for both NCS and CS students. The materials were also compatible with school-based curricula, and also with the curriculum recommendations from the Hong Kong government.
For the community domain activities, results indicated that they could provide experiential learning for NCS students to understand and integrate into their local communities, with principals and teachers mentioning that the activities allowed NCS students to gain knowledge and life experiences.
The rationale behind adopting an H-S-C framework was to let NCS students experience whole immersion in Chinese environment that would otherwise be only available to local students with Chinese as their mother tongue in homes, schools, and communities (Krashen, 1982;Long, 1996;Brown, 2007). Regarding acquiring Chinese as a second language, it is generally thought that NCS students learn Chinese only as a transitional stage. They are actually expected to gain close to the L1 Chinese language competency under the local system. The CS children's acquisition of Chinese starts to happen naturally at home and in their daily living. Chatting and socializing among peers in the community also contributes to their mother-tongue development. By contrast, except through formal school education, NCS students have limited exposure to environments favourable to learning and practicing Chinese, and it is thus understandable that their learning Chinese is obstructed to a certain extent. The constraint of less exposure of NCS students can be ascribed to less local community participation of some ethnic minorities in Hong Kong society.
To achieve the goal of enhancing effective learning of Chinese of NCS students, the space of learning (Marton & Tsui, 2004;Tse et al., 2005) has to be created by co-constructing the learning environments in the three domains of home, school, and the community. The space of learning can be regarded as the past experience of a learner that enables him/her to distinguish the differences and similarities in the present learning condition. They should be aware of the critical features of the learning object. This space can be widened if the learners are provided with opportunities to explore the learning object (in the present situation is the learning of Chinese). It is therefore essential to create changes by building the capacities of parents, principals, teachers, and teaching assistants. With improved Chinese language proficiency and better cultural exchange, NCS students are benefited in their future academic studies, such as having better opportunities in Primary 1 transition. Also, the CR pedagogy provides NCS students with a better sense of belonging to, and integration into the community. Though collaboration among home, school, and community is promoted in many places, few were well-structured and resourced for its full local implementation for early childhood education. Apart from kindergarteners, this H-S-C approach is also applicable to primary school NCS students for learning Chinese. Learning Chinese as a second or foreign language is a global trend. As reported, there were 6.5 million candidates taking different kinds of Chinese Proficiency Test, a proficiency test for non-native Chinese speakers, in 2017 (Xinhuanet, 2018). Though Cantonese as the spoken Chinese is discussed in the present paper, the H-S-C framework is applicable to Chinese learners all around the world.

Conclusion
The "C-for-Chinese@JC" project is well-resourced with lots of intervention programs. It is influential to academics, parents, educators, social workers as well as policymakers. As proven in the present paper, the concerted effort from home, school, and community domains is the most effective way to support NCS students; thus it is ideally to have interventions in all three domains. If there is concern about resource, it is suggested to start with the child's microsystem (i.e., parents and teachers) as it has most impacts on one's development. Building the capacity of parents and teachers is probably the first step to enhance the learning effectiveness of NCS students. The study also shows that, for improved learning of Chinese for NCS kindergarten students, the reconstruction of an L1-like environment, through the implementation of an H-S-C framework, should be put into local practice in order to benefit more NCS students.
This paper presents a general validation using multiple sources of evidences, rather than in-depth validation of every single program or activity because of space constraints. Moreover, with limited page length, it is out of the scope of this study to go into all of the many principles behind the implementation of the H-S-C model. It is hoped that these aspects could be addressed in more focused studies in the future.

Funding/Financial Support
This work and the "C-for-Chinese@JC" project were supported by The Hong Kong Jockey Club Charities Trust.