Dozens of motivational theories exist and most have been around in one form or another for years. Motivation can be either intrinsic or extrinsic, most individuals subscribe to a combination of the two in their lives. The escape theory portrays people as wanting or needing to escape the uncomfortable reality that they find themselves in. A good example is the child that grew up poor and when reaches college age, immerses themselves in study to achieve a goal of an education and a better opportunity to earn a decent living.
The acquired needs theory says that some of us seek power, affiliation, or achievement. Most of us seek out a sense of belonging and affiliation with peer groups.This may be the student that joins a fraternity.
The control theory advocates having some sense of controlling the world around us and hence our futures. This student may be the single mother that was laid off from a factory job.
Most motivational theories somewhat overlap and have commonalities whether intrinsic or extrinsic. Internal or external stress's could be relevant to almost all motivational theories as could the concept of conflict between reality and aspirations.