The motivation to initiate, attend, and participate in treatment is one of many factors that mediates clinical success. Research examining the role of client motivation in Speech–Language pathology has been minimal and restricted to fluency and voice disorders. The unique influence of client motivation prior to, or during, treatment remains largely anecdotal. This entry discusses research regarding client motivation—with specific focus on individuals who stutter—within a broader clinical framework established in the field of psychology, namely, the transtheoretical or stages of change model.