The document discusses the differences and relationships between motivational interviewing (MI) and client-centered therapy. It explores how definitions of MI have evolved over time from a set of concepts and precepts to a more directive method for enhancing motivation. The document also examines debates around key terms like "equipoise" and whether a binary or fuzzy logic is more appropriate for understanding MI. Clarifying definitions is important for research on evidence-based practices and ensuring interventions are implemented with fidelity.