Projection is the study of how to get the most power out of any technique staying within balance and staying in the principle of changeableness.  Power is achieved from the ground and gravity.  Through the development of a good body that is relaxed yet firm one can provide a great conduit for energy to unitarily travel through the body and to project out of the body into a target.  Project is not just studied for its own merits but how it would fit into an entire encounter.  Percentages and probabilities are taken into account so that one is always making the optimal choice in combat regarding Projection.