Historically, mission movements have arisen through faithful revival movements, along with theological insights and prayers. As time has passed, theologizing or theological work has progressed. After consideration and examination of goals, methods, ideas, problems, and results of mission, usually too many complete theories have been presented. Consequently, there has sometimes developed a no-action situation in which nobody does anything. Ironically, there is sometimes mission theology which encourages mission movement and sometimes that destroys mission movement.
Mission is substantially movement.
It is what springs out. It is an event. Paul was an apostle and a missionary prior to being a theologian. Writing the Epistles, he did not call himself a theologian even once. He was given his mission as an apostle who was to preach the Gospel to the heathen, not as a theologian.