The Effect of Instructional Leadership, Knowledge of Educational Management, Work Motivation and Job Satisfaction to Organizational Commitment of Head of Junior High School (SMP) in Medan, North Sumatera, Indonesia
Maju Siregar

Abstract
This study aims to identify and assess: (1) instructional leadership influence on work motivation, (2) the effect of knowledge of educational management on work motivation, (3) instructional leadership influence on job satisfaction, (4) knowledge of educational management influence on job satisfaction, (5) instructional leadership influence on organizational commitment, (6) knowledge of educational management influence on organizational commitment, (7) the influence of work motivation on organizational commitment, and ( 8 ) the impact of job satisfaction on organizational commitment. And also to determine the theoretical model to describe the relationship that can causalistic between latent variables that determine the principal organizational commitment. The research was conducted at the Junior High School (SMP) in Medan, involving 186 head of SMP as respondents. Data organizational commitment, instructional leadership, work motivation, and job satisfaction captured using a multiple-choice questionnaire Likert scale models, while the data captured with the knowledge of educational management using multiple-choice tests. Instruments tested prior research, which is to test the validity by the Product Moment correlation and to test the reliability by Cronbach Alpha formula, but special instruments of knowledge of educational management by using the KR-20 formula. Techniques of data analysis is done in two phases, which are descriptive and inferential. The purpose of descriptive analysis is to describe the characteristics of the data such as mean, median, mode and variance. Inferential analysis is used to test the hypotheses and research requirements. Test Requirements analysis includes: test data normality and linearity test regression. Normality test data for each variable using the Kolmogorov Smirn of Test. Linearity between variables regression test performed using a statistical F test. To test the hypothesis used path analysis and to test the suitability of the theoretical models used the goodness of fit by using Chi Square. Results showed: (1) instructional leadership positive direct effect on work motivation, (2) knowledge of educational management positive direct effect on work motivation, (3) instructional leadership positive direct effect on job satisfaction, (4) knowledge of educational management positive direct effect on job satisfaction, (5) instructional leadership positive direct effect on organizational commitment, (6) knowledge of educational management positive direct effect on organizational commitment, (7) work motivation immediate positive effect on organizational commitment, and (8) a positive direct effect of job satisfaction on commitment organization . Based on the acceptance eighth research hypothesis then found a fixed model or theoretical model that describes the structure of a causal relationship between the variables of instructional leadership, knowledge of educational management, work motivation, job satisfaction, and organizational commitment of head of Junior High School (SMP).

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