||Location (Not Relevant: All the projects are in the same location.)
Customer (Not Relevant: All projects in this organizational unit belong to the same customer: Ministry of Economic Affiliation (MOEA) of Taiwan government.)
Size (Not Relevant: Projects are in similar sizes, and follow the same processes.)
Organizational Structure (Not Relevant: The OU is a functional organization, project members are selected form different R&D groups, according to their specialties. All the projects 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.