Certified Addiction Counselor (CAC) Practice Exam 2025 - Free CAC Practice Questions and Study Guide.

Reliability in an assessment instrument specifically refers to the ability of that instrument to consistently yield the same results over repeated applications or under similar conditions. This means that if an individual takes the same assessment multiple times, or if two different assessors use the instrument on the same subject, the outcomes should be similar. This consistency is crucial in ensuring that the assessment is stable and dependable for measuring traits, behaviors, or outcomes, which is essential in clinical settings where decisions may be based on these results.

The other choices relate to different aspects of assessment in a counseling context but do not define reliability. For instance, a method for assessing client satisfaction focuses on gathering feedback about the client's experience rather than the consistency of results. Gathering client history is a vital part of the assessment process but does not address reliability. Similarly, measuring client engagement during sessions can be important for understanding therapeutic progress but is distinct from the concept of reliability. Thus, B is the most accurate descriptor of what reliability encompasses in assessment tools.