The theory of personality has its basis in the theories of learning, and focuses on the effects of environment on one's behavior.

This is the behaviorist theory. This viewpoint takes into account all the ways in which we learn about our world and how we try to link these learned behaviors with our own thought processes. In addition, the behaviorist viewpoint is heavily in favor of seeing these behaviors as shaped by our outside environment, instead of being unconsciously determined.

What was the length to begin with?