To assess the impact of a group, which approach is recommended?

• A. Have an outside 'observer' sit in during group sessions and consequently rate the level of behavioral change.
• B. Hand out a written evaluation form during the final session.
• C. Give each member a pretest and a posttest utilizing a projective measure.
• D. Hold a follow-up session so members can share experiences.

Answer: (A)

Assessing a group’s impact is best done with an independent observer who notes and rates behavioral changes as they occur across the sessions. This approach provides an objective, standardized way to document how group members act, interact, and adapt over time, offering a reliable picture of real changes in behavior rather than relying on self-reports or memories. The observer can use a consistent rating system and observe patterns that participants may not articulate, giving a credible measure of impact that can be compared across groups or over time.

Relying on a final-session written evaluation, a pretest/posttest with a projective measure, or a follow-up discussion each has limitations. A written form at the end captures only retrospective self-perceptions and can be biased or incomplete. A projective measure often has questionable reliability and validity for determining real-world group change. A follow-up session provides rich, qualitative insights but hinges on memory and subjective reporting, which can skew conclusions. The observer-based method balances objectivity with ongoing, concrete observation of change, making it the strongest option for evaluating impact.