Objective of this research is to test the effect of transformational leadership, personality and group
decision making to Organizational Citizenship Behavior (OCB) to 260 public school teachers selected by using
proportional random sampling out of 20 Junior High Schools in Lampung province, Indonesia. Quantitatively
and qualitatively through Sequential Explanatory Design, the research concludes that OCB is positively
and significantly affected by transformational leadership, personality and group decision making counted of
52,7% (R2 = 0,527, α = 0,01%) revealing other 47,3% to influence OCB. Qualitative finding strengthens
the existence of other factors affecting OCB. The research brings implication that to boost teachers’ OCB, the
school principal must enhance the transformational leadership skill through developing capabilities in strategic
planning and change management.
Keywords: transformational leadership, personality, group decision making, Organizational Citizenship
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