The experimental field of this analysis was among twenty two project teams within the west of the Islamic Republic of Iran. Results indicated that each person-oriented and task-oriented leadership behaviors were directed and completely associated with team learning. Team stability didn't mediate the connection between leadership and team learning; but, a powerful direct relationship between team stability and team learning was found. The relationships found between task-oriented leadership and team learning became non-significant together with personally-oriented leadership and team stability. This combined set of leadership behaviors and team stability, however, explained additional variance in team learning than every of the independent variables individually did, or than person directed leadership combined with team stability did. These findings have implications for interventions by all stakeholders of project teams, aimed toward increasing team learning.