Final answer:
Motivational Interviewing, developed by William Miller, is a method used to elicit and strengthen an individual's motivation and commitment to change their substance use behaviors, with effectiveness supported by evidence in treating substance use disorders.
Step-by-step explanation:
The method developed by William Miller to elicit and solidify clients' motivation and commitment to changing their substance use behaviors is known as Motivational Interviewing (MI).
Motivational Interviewing is a client-centered, directive therapeutic style to enhance motivation by helping clients explore and resolve ambivalence.
It is grounded in the concept that the responsibility and capability for change are within the client, and that the therapist's role is to elicit that motivation and commitment to change by expressing empathy, helping the client to develop discrepancy between their goals and their current problematic behavior, rolling with resistance rather than confronting it directly, and supporting self-efficacy.
Motivational Interviewing has been evidenced to be effective in various settings, including in the treatment of substance use disorders.
It relies on the therapeutic relationship and uses strategies to empower individuals to make positive changes in their lives, which aligns with the earlier-stated principles of intervention, such as therapeutic/healing, growth/change, and confronting complacency.