Measurement variables | Human Resource Management homework help

Read the attached lecture and then see below.  

When should you identify the measurement variables to be used for evaluation and feedback?

A. Diagnosis Stage

B. Intervention Stage

C. Implementation Stage

D. Evaluation Stage

Discuss and explain your choice.

Each of the stages provided are a part of the intervention process? Place the stages in order and discuss the elements of each one. Which one seems the most difficult to you and why?