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This study was aimed at finding: The influence of organizational culture on work motivation; the influence of leadership on work motivation; the effect of cognitive ability on work motivation;) the influence of organizational culture on employee performance; the influence of leadership on employee performance; the effect of cognitive abilities on employee performance; and the effect of work motivation on employee performance. The research findings revealed the performance of employees in the Office of Communication and Information (Diskominfo) of North Sumatra Province directly affected by Organizational Culture, Leadership, Cognitive Ability and Work Motivation. Based on the hypothesis testing it concluded: there is a direct influence of organizational culture on work motivation, there is a direct influence of leadership on work motivation, there is a direct influence on cognitive abilities on work motivation, there is a direct influence on organizational culture employee performance, there is a direct influence of leadership on employee performance, there is a direct influence of cognitive abilities on employee performance, and there is a direct influence of work motivation on employee performance. The results of the study provide an overview of organizational culture, leadership, cognitive abilities, and work motivation affecting employee performance both directly and indirectly which reached 78.95%.