Motivations and Purposes are the first and last dimensions, but that is not enough. Motivation gives a character the force to move, Purpose gives a character a direction in which to move. For this, he needs a Methodology, which is the third dimension of character. Methodologies describe the kinds of approaches a character might use in its efforts to achieve its purposes. This might seem like enough dimensions.
Evaluations are the standards by which characters measure their progress.
As an example of the concept of Evaluation, imagine two business partners who share motivations, methodologies and purposes. Still, they might argue if sales are up but satisfaction is low because one evaluates based on gross sales and the other evaluates based on customer satisfaction. As a result, the two partners argue all the time, even though they agree in all three dimensions of Motivation, Methodology, and Purpose. Difficulties can arise between characters in any one of the four dimensions, even though they might agree completely in one or more of the other dimensions. In short, characters are never fully developed unless they are represented in all four dimensions, and they may come into conflict over any combination of Motivations, Methodologies, Means of Evaluation, or Purposes.