Final answer:
Outcome assessment is the process evaluating a person's progress post-treatment to measure the effectiveness of treatment plans and interventions.
Step-by-step explanation:
The process of evaluating a person's progress after he or she has been in treatment is known as c) Outcome assessment. Outcome assessment involves systematic evaluation of various parameters to determine the effectiveness of a given treatment plan for a patient. This can include measures such as symptom reduction, improvement in quality of life, and achieving specific treatment goals. In contrast, a case formulation (a) refers to a hypothesis about the causes, precipitants, and maintaining influences of a person's psychological, interpersonal, and behavioral problems. A treatment plan (b) outlines the proposed therapy and interventions for addressing the person's issues, and a diagnostic interview (d) is used to gather information about the person's history and symptoms to make a preliminary diagnosis.