Latent growth curve analysis was used to assess motivation change across 3 time points for 120 therapeutic community residents. Models included the time-invariant predictor of readiness for treatment, which significantly predicted initial treatment motivation but not the rate of motivation change over time.The therapeutic community (TC) model is widely practiced in more than 65 countries as one of the most commonly applied modalities of substance abuse treatment (Bunt, Muehlbach, & Moed, 2008;De Leon, 2000). The TC model reduces both drug use and recidivism, while increasing employment rates, social and emotional functioning, and other variables related to health and quality of life in general and to special client populations (e.g., De Leon, Sacks, Staines, & McKendrick, 2000;Hubbard, Craddock, & Anderson, 2003;Jainchill, Hawke, & Messina, 2005;Moos, Moos, & Andrassy, 1999;Simpson, Joe, & Broome, 2002). Across these (and other) studies, findings consistently highlight that the TC model facilitates psychosocial change in individuals recovering from substance abuse. Nevertheless, little to no research covers how this change occurs. Consequently, a study of how individuals who abuse substances change during the course of TC treatment (one of the most common substance abuse treatment modalities) is critical to the study of treatment and recovery from addiction.Within the study of TC treatment, motivation and readiness for treatment function as key variables (De Leon, 2000). Motivation is the desire to make a behavioral change, and readiness for treatment is defined as the acceptance that help can be obtained only through entry into a treatment program (De Leon, 2000;DiClemente, 2003). Research confirms clinical experience that client motivation for change and readiness for treatment play a critical role in remaining in and adhering to the parameters of TC treatment. For instance, research has consistently demonstrated a positive relationship between higher motivation for treatment and retention, treatment engagement, and positive therapeutic outcomes (e.g., Broome, Simpson, & Joe, 1999;De Leon, Melnick, Kressel, & Jainchill, 1994;Joe, Simpson, & Broome, 1998;Melnick, De Leon, Hawke, Jainchill, & Kressel, 1997 Behavioral and Historical Studies, Centenary College, Box #403, 400 Jefferson Street, Hackettstown, tion possesses a fluid quality and, as such, changes over time (DiClemente, 2003;DiClemente, Schlundt, & Gemmell, 2004). For instance, flight into health (De Leon, 2000) is a phenomenon in which the motivation and perceived readiness for treatment in some TC clients actually subsides over time. Clients perceive initial treatment gains as the successful resolution of their addiction problem, resulting in waning motivation. Therefore, when clients experience a flight into health phenomenon, enhancing or refocusing their motivation will help to maintain their commitment to TC treatment.All therapeutic services offered in treatment can be conceptualized as mechanisms for facilitating the motivation to change unheal...