| Sampling Factors: |
Location (Not Relevant: In one location. (Wuhan))
Customer (Not Relevant: Railway customer)
Size (Not Relevant: All projects are similar size,4 to 5 people)
Organizational Structure (Not Relevant: Same organization structure(R&D center))
Type of Work: New projects or Upgrade projects |
| Sampling Factor Values: |
New (Type of Work): New projects
Upgrade (Type of Work): Upgrade projects |
| Subgroups: |
New: New requirement or new product
4 People, 1 Basic Units
– New
Upgrade: base on the company old projects, add new function or modify some functions
10 People, 2 Basic Units
– Upgrade |