(1999) FIDIC Conditions of Contract for Construction for Building and Engineering Works Designed by the Employer. International Federation of Consulting Engineers.
http://fidic.org/books/construction-contract-1st-ed-1999-red-book

has been cited by the following article:

• TITLE: Fédération Internationale Des Ingénieurs Conseils (FIDIC) Variation Order Clause

  AUTHORS: Moustafa Kotb, Mohamed Ibrahim Abdel Razik, Reda Abbass Sabry

  KEYWORDS: Variation Order, FIDIC, VO, Change Order, Clause 13

  JOURNAL NAME: American Journal of Operations Research, Vol.7 No.6, November 27, 2017

  ABSTRACT: To paraphrase the Greek philosopher Heraclitus, change is the only constant in construction projects. Changes in scope occur as projects progress from design through practical completion. FIDIC General Conditions Clause 13 [1] is one of the most important terms and implementing. It is also major factor for project success. Once all project parties understand and fairly use this clause, the impact will be minimising the expected disputes by 50% at least. Thus, this paper is considering illustrated variation order clause by flow chart technique to ensure that all the engineers are handling easily those subclasses.