||Location (Not Relevant: All projects are conducted in a single location (Shanghai).)
Customer (Not Relevant: All the projects are R&D projects, requirements may collect from internal or external requirement providers, but it is no impact on the processes.)
Size (Not Relevant: All the projects are in the similar size.)
Organizational Structure (Not Relevant: All the groups are following the same processes.)
Type of Work (Not Relevant: All the works are development type works.)
No sampling factor: All projects have similar characteristics, cannot find sampling factor to distinguish them.