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To examine the correlations among environmental perceptions, motivational beliefs, and self-regulated learning of Tehran third-year high school boys based on a proposed model, multistage cluster-sampling method gave a sample of 685 students. The Motivated Strategies for Learning Questionnaire (Pintrich & De Groot, 1990), Students' Achievement Goal Orientations (Midgley, Kaplan, Middleton, Maehr, Urdan, Anderman, et al., 1998), Students' Perceptions of Classroom Activities (Gentry, Gable, & Rizza, 2002), and Perceptions of Parents Scales (Grolnick, Deci, & Ryan, 1997) were administered. Analysis showed relations among components of self-regulated learning, family environmental perceptions, perceptions of classroom activities, and motivational beliefs. Structural equation modeling indicated the proposed model had an acceptable fit to the data. All paths or structural coefficients of the proposed model were statistically significant.