چکیده (انگلیسی):

The study present a model to describe structural relations between three groups of variables based on
theories. The model is containing of class variables (connectedness, personal growth and management system),
psychological basic needs (autonomy, competency and relatedness) and academic engagement (behavioral,
cognitive and affective). A sample of 360 students participated in research. Results showed model have a good fit,
also class variables have direct significant effect on psychological basic needs and on academic engagement in
directly except of behavioral engagement (may be because of suited discipline and regularity).the correlation
between class perception and academic performance was significant (but low) and between psychological basic
needs and academic performance was significant considerably.