THE EFFECT OF INSTRUCTIONAL LEADERSHIP, KNOWLEDGE OF EDUCATIONAL MANAGEMENT, INTERPERSONAL COMMUNICATION AND JOB SATISFACTION ON ORGANIZATION COMMITMENT OFTHE SENOIR HIGH SCHOOL PRINCIPALS (A CASE STUDY IN SENIOR HIGH SCHOOL IN MEDAN MUNICIPALITY)

This study was aimed to reveal the determining factors of the senoir high school principals organization commitment in Medan Municipality, and to find out a theoretical model which could describe the causal relationship among the latent variables determining the principals organization commitment. The population consisted of 202 principals and 127nprincipals were taken using the proportional random sampling as the sample. The data on the organizational commitment, instructional leadership, interpersonal communication, and job satisfaction were collected using questionnaires with Likert scale, while the data on knowledge of educational management were collected using the test. Instrumen tested prior research, which is to test the validity by Product Moment correlation and to test the reliability by Cronbach Alpha Formula. The pre-analysis testing included the normality test and the linearity test, while the hypothesis was tested using the path analysis. The result showed (1) instructional leadership positive direct effect on interpersonal communication, (2) knowledge of educational management positive direct effect on job satisfaction, (3) interpersonal communication positive direct effect on organizational commitment Based on this, a theoretical model which showed the causal relationship among the variables of the instructional leadership, knowledge of educational management, interpersonal communication, job satisfaction, and organizational commitment of the senior high principals was developed