With this lesson all our case studies will emphasize the development of deductive skills to more confidently forecast events based on congruent causes.

All prediction is based on a firm understanding of the natal chart, the natal chart itself being the basis for all of life's events. But forecasting, that is the timing of life's events - based on the potential as seen in the birth chart - is a deductive process that begins with the agreement or its lack existing between different causes when applying the different timing techniques. For example, what a primary direction may promise may be confirmed by the presence or negated by the lack of a corroborating solar return. It is for this reason that Morin states that the vast majority of primary directions do not produce significant events.

This cooperation or agreement between causes as seen in the different timing techniques to provoke or manifest an event as seen in potential natally is what Morin calls "concordance" or "concordant causes."