Which core function involves the evaluation of a client’s situation and needs?

The core function that involves the evaluation of a client’s situation and needs is Assessment. This process is critical as it allows the counselor to gather detailed information about the client's substance use history, mental health status, social environment, and any other factors that may impact their recovery. During the assessment phase, various methods such as interviews, questionnaires, and behavioral observations are utilized to create a comprehensive understanding of the client's unique challenges and strengths. This foundational step is essential for developing an effective treatment plan tailored to the individual client's needs, which can then guide the subsequent stages of care.

In contrast, Counseling focuses on providing guidance and support to individuals as they work through their challenges. Case Management involves coordinating various aspects of a client’s care, ensuring they receive the necessary resources and services. Crisis Intervention is specifically for responding to immediate, urgent situations that require rapid response, rather than a thorough evaluation of the client's overall circumstances. Understanding these distinctions highlights why Assessment is the correct answer when discussing the evaluation of a client’s situation and needs.