This article is based on the French report and the European comparative results of an international project about inclusive education supported by the European Commission (DOCA project, Muskens, 2009 and Zay, 2009). It focuses on one of the main issues and the specific methodology of the French report. Globalisation has led to facing the issue of making life together possible for native and immigrant populations on the same soil. How to build a common citizenship, with the same rights and duties, for diverse populations separated by their birth community, religion, history, customs and traditions? Which kind of education, and which kind of school are able to elaborate a new common heritage for citizens-to-be? Through research results, the paper compares the advantages and failures of the French republican secular school with others. It resumes the French conclusions to propose a cooperative school inspired by the spirit of the Council of Europe directives and developing social ties based on differences. This paper is completed by another developing the DOCA project theoretical framework relatively to Inclusive Education, with case studies and empirical studies extending it after its end - D. Zay and G. David Padoani, What could be an inclusive education for all ?