<![CDATA[This research aimed to (1) determine the relationship between achievement motivation and school principal’s leadership effectiveness, (2) investigate the relationship between interpersonal communication behavior and leadership effectiveness of school principals, and (3) discover the relationship between the school principal’s leadership effective and the achievement motivation and interpersonal communication behavior. The type of this study was correlational. The research population was 175 primary school principals in East Sumba Regency, and the target population was all principals of public primary schools. This research employed questionnaires to collect data and the multiple correlation analysis with regression to analyze the data. This study revealed a significant relationship between the school principal’s leadership effectiveness and achievement motivation and interpersonal communication behavior. The effectiveness was indicated by the score of the correlation coefficient variable of achievement motivation by (r) 0.245 with a significance (p) of 0.001 and the score of interpersonal communication behavior variable (r) of 0.381 with a significance (p) of 0.000. This study suggests three points. First, the Education Department of East Sumba Regency, as the policymaker, must improve the training for school principals. Second, the government is urged to make education or training policies to improve school principals’ professionalism. Third, other researchers are advised to investigate school principals’ leadership effectiveness using different variables or settings.]]>
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