The present paper is based on research study undertaken to find out the effect of classroom management skills as a parameter of personality development module on teacher effectiveness of teacher trainees in relation to locus of control. An experiment was conducted on 300 teacher trainees. For data collection, teacher effectiveness scale was developed by the investigator. Analysis by t-test revealed that the teacher trainees taught through classroom management skills as a parameter of personality development module attained more teacher effectiveness than the students taught through traditional strategies.