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In the ERP project implementation, it is an important mean to control the implementing risk effectively that distinguishing and fulfilling ERP project risk sharing responsibilities between the enterprise and the partners. Starting from the three-stage of decision and three-layer structure of main participants, this paper constructs risk sharing index system and constructs model to obtain risk sharing initial proportion for ERP project using AHP, then using the balance of responsibility, right and benefit to convert risk allocation to profits allocation problem. Starting from the goal of maximizing the overall satisfaction of all partners, the paper constructs the second stage model based on Nash negotiation.

Because ERP project is a complex enterprise information engineering which includes multi-stage, multi-activity and multi-partner, so many enterprises and scholars focus on risk controlling [

At present, researches on risk sharing are mainly focused on the field of engineering project cooperation, supply chain cooperation, finance and risk investment cooperation et al. For example, for PPP project Yongjian Ke, Albert [

Through analyzing, we find that prior studies still have some deficiencies: 1) Only pursuing rationality and objectivity of allocation results, but not paying enough attention to whether the partners are satisfied with the results and are willing to accept them, so the responsibility of risk sharing can’t be put into effect easily; 2) It did not take responsibility, right and profit into consideration in risk allocation, and lacked attention on benefits driven of risk sharing; 3) The target of risk allocation failed to reflect direct requirements of risk control.

Therefore, other ways are needed to be further explored so that the results of risk allocation can be more reasonable and accepted by partners easily.

Nash negotiation model is a good research method in interest distribution, it has made some achievements. For example, Weidong Feng [

As to existing problems in the prior research, the basic thinking of building the risk sharing model is put forward (shown in

The risk sharing proportion reflects responsibility proportion of risk control and bearing proportion of risk results, Therefore, the construction of ERP project risk sharing model should not only focus on total goal of effective risk control, but also should reflect the willingness of each partner, which can make the partners have a higher identification and satisfaction and make the decision process embody democracy and consultation fully. Then real responsibility risk allocation will be accomplished explicitly, the process will be open and the risk control can be put into practical. For this, this paper will achieve the optimization goal of risk sharing by constructing twostage model below.

Starting from target of risk control, based on risk allocation decisions to consider the main influence factors, according to the principle of “the influence degree of risk control decide the proportion of the risk”, with the role of all levels weights of analytic hierarchy process, we calculate the total influence degree of all the partners of risk control which is the degree of importance of the partner in the risk control, and transfer them to the partner risk proportion and get the initial sharing proportion plan of risk allocation.

According to the balance principle of responsibility, right and profit, the ERP project risk allocation problem is not only a risk liability distribution and practicable problem, but also a profit allocation problem of practical equivalence of risk liability, so the risk allocation problem can

be converted into interest distribution problem when considering risk sharing synchronously, which can be settled by Nash.

Therefore, the second stage starts from the initial plan of the first stage, targets with the overall satisfaction of each partner, and then constructs Nash negotiation model and makes full use of democratic consultation mechanism. All partners can refer to the calculation results for decision-making, if they accept, then the solution will be the optimal share scheme. If there is one or more partners does not accept the scheme but will be willing to continue to negotiate, then each partner can again give consultation proportion in the condition that the whole satisfaction will not reduce according to the consultation proportion, recalculating the allocation proportion. The negotiation process has been continuing till all partners can accept the distribution proportion. Therefore, through Nash negotiation model, we can obtain risk allocation scheme with the highest overall satisfaction.

To control project risk is the core goal of the risk allocation. For the targets of risk control and features of ERP project implementation, starting from the decision thinking mode “Looking before and after, considering the reality,” the main influence factors can be divided into risk bearing intention, risk control ability and risk bearing ability. Meanwhile, considering ERP project implementation usually appear in the form of organization, taking the team as the main participants and using the project manager responsibility system. So according to different role of each participant playing in the risk control, the main participants are divided into three levels: enterprise, implementation team and project manager. The enterprise mainly provides the various related resources for risk management and control; implementation team ensures all kinds of effective methods and technical support for risk management and control; managers need to have management skills for risk management and control, which are of the three levels of main body structure of risk control. Starting From two dimensions of three-layer structure of main participants and three-phase risk control decision-making process, the risk sharing influencing factors analysis matrix of ERP implementation (shown in

According to the independence and quantifiable of index system, based on advice from interview with senior experts, we modified and refined indexes, finally obtained a set of risk sharing hierarchy model (shown in

1) Model Construction This model includes four sections: the goal layer, criterion layer, sub-criteria layer and scheme layer.

The first layer is the goal layer, which is the optimal risk allocation proportion for controlling risk R_{x}, which means to the purpose of solving problem.

The second layer is criterion layer, that is, determining the main index of risk sharing, including risk bearing intention, risk control ability and risk bearing ability. It is expressed by the corresponding weights set is. Where W_{i} means relative importance level of main index C_{i} among controlling risk R_{x}.

The third layer is sub-criteria layer, which determines secondary index layer of risk sharing proportion expressed by C_{ij}, the corresponding weights sets is

, where W_{ij} means the relative importance level of secondary index C_{ij} to the main index C_{i}.

The fourth layer is scheme layer, that is, the layer of project risk sharing scheme, that is, potential risk bearing partner of project implementation (project implementation partners), expressed by P, , the corresponding weights sets is, where X_{ijn} means the relative influence level of the partner n for the risk sharing factors C_{ij}.

2) Parameters Determination The parameters of the model are mainly the weight of the criterion layer and the sub-criteria layer. We can get the corresponding weights according to pairwise comparisons of two indexes in the analytical hierarchy process.

Through surveying 10 typical ERP implementation enterprises in China and making interview purposefully with ERP implementation project manager, informatization manager and ERP implementation consulting senior experts participated in ERP implementation et al., they gave the estimate matrix, then we calculated the weight using the arithmetic average method, the specific score and the weight are shown in

Similarly, through the same grading and calculation method used in first-class index, the weights of secondclass index are as follows:

3) Model Solution After determining the weight of each layer, the key to solve the model lies in how to obtain the relative importance value of each partner for the sub-criteria layer indexnamely the measuring variables of the model. For one index of sub-criteria layer, by comparing the corresponding weights X_{ijk} of partner k to this index, then we can determine partner k’s risk bearing ratio according to Formula (1).

The ERP project is a complex engineering which has more participants in implementation process. It’s good to improve all partners’ satisfaction to adopt the negotiation way to determine the risk allocation scheme. Therefore, on the basis of risk allocation initial proportion, further to determine risk sharing proportion scheme with the largest overall satisfaction through the democratic negotiation.

For more negotiation problem, Nash had put forward negotiations model of multi-people negotiation countermeasure [

Supposing partner i puts forward a risk allocation scheme, that is. where q_{ij} means the partner j’s risks allocation proportion presented by the partner i in risk sharing coordinate projects,. and. So n partners will put forward n risk sharing coordinate projects, which will a order matrix:.

Supposing highest expected risk sharing ratio of partner i is, so highest potential risk sharing scheme set of ERP implementation partner is

. But, it

Can’t satisfy the constraint conditions of all risk bearing proportion is 1, so negotiation is needed between all partners. Setting the lowest expected risk share ratio of partner i is, So ERP implementation partner lowest risk sharing scheme set is

Supposing r_{i} is the risk bearing proportion of partner i. For partner i, bearing risk and benefits are symmetrical. So the satisfaction of risk allocation scheme of partner i can be expressed as:

where is the starting point of the negotiations to partner i, the lowest satisfaction of partner i is:

According to Nash negotiate model: Objective function:

Constraint conditions:

Using Kuhn-Tucker conditions [

Formula (6) is the solution to Nash negotiation model based on the satisfaction, represents reserved risk ratio of partner i, namely the negotiation basis points, represents risk allocation compensation proportion of partner i.

1) Determination of Parameters

The parameter reflects the importance level of role which partner i play for controlling some risks in ERP implementation.

In order to construct the Nash negotiation model, it needs to determine the value of the parameter. Because the degree of each partner’s role in risk control can be influenced by its bearing willing, control ability and bearing ability, while the construction of the first-stage model is the index system established on the basis of considering these factors. Therefore, risk allocation proportion obtained from the analytic hierarchy process can also reflect the importance level of role which all partners play for controlling risks in ERP implementation. Let, then.

As long as determining the value of, the next step is to solve the model.

2) Model Solution After determining the model parameters, each partner needs to put forward their risk sharing scheme in negotiate range according to the risk allocation initial proportion of the first phase, we can get a order risk allocation coordinate projects set.

According to the value of the parameter and combining formula (6), we will get the solution of the Nash negotiation model, that is,

4, where is the risk allocation proportion when partner i has biggest satisfaction.

If the risk allocation proportion is accepted by all partners, that is, we get the final risk allocation proportion. Otherwise, keeping the overall satisfaction nondecreasing, through continuous negotiations the partners put forward risk sharing coordination projects and coming into the next round of Nash negotiations model solution until the partners get risk allocation proportion which all partners are satisfied with.

The paper explored the best sharing plan by constructing the ERP project implementation risk sharing two-stage model, which provides a new idea for rational sharing of ERP project implementation risks. The two-stage model of risk sharing not only reflects the objective requirements of risk sharing, but also the characteristic of democracy and friendly negotiation, it has strong maneuverability and its results will also be accepted by each partner easily. In the future, research need to combine risk sharing problems with each partner contract formulation process to provide legal safe guard for the effective implementation project risk sharing results.

This work is supported by the National Natural Science Founds Project (70972052); the Natural Science Foundation of Shaanxi Province (2009JM9005); the Department of Education Science Research Project Program of Shaanxi Province (09JK159); the Department of Education Science Research Project Program of Shaanxi Province (11JK0189).