Final answer:
Evaluation is the process that evaluates the effectiveness of interventions provided and documents the client's response.
Step-by-step explanation:
The process described in the question is Evaluation. Evaluation involves a systematic investigation to assess the effectiveness of interventions provided and document the client's response. In this case, community psychologist evaluators were hired to evaluate a program for housing retention and cost-benefit analysis. They used social science methodologies, including interviews and surveys, to gather data and assess the program's fidelity and outcomes.