||Location (Not Relevant: All Work done in single Location Shenzhen, hence it is not a sampling factor.)
Customer (Not Relevant: The same customer type for all basic units, hence it is not relevant sampling factor.)
Size (Not Relevant: All projects are almost of the same scale, hence it is not a relevant sampling factor.)
Organizational Structure (Not Relevant: All teams report to one senior manager and all basic units belong to one technology department, hence it is not a relevant factor.)
Type of Work: Projects are developed in the similar technology but Project Lifecycle(Iteration , Waterfall) is different for all basic units. Different project Lifecycle results in different tailoring in processes, such as engineering and project management processes, hence considered relevant for sampling.