This document provides an introduction to motivational interviewing and the stages of change model. It discusses that motivation is something a person does, not something they have, and involves recognizing a problem and searching for solutions. Motivational interviewing aims to minimize resistance and resolve ambivalence. Readiness levels are accepted as starting points rather than reasons for exclusion from treatment. The stages of change are precontemplation, contemplation, preparation, action, and maintenance, with the goal of treatment matching the strategies used to the individual's current stage of change.