The individual responds to certain stimuli as a reaction to what is occurring within themselves. Would it not be important, then, to understand more than merely the internal workings of the person, but to fully comprehend the impact this individual is having on the external world around them: human behavior.Human interaction could be considered a likely situation by which to measure human behavior, which is increasingly important within the modern business world. Douglas McGregor, a renowned theorist on human behavior, theorized that works within an organization fit into two specific categories, lazy and generally inherently unresponsive to corporate needs (Theory X) and the worker that can be motivated and stimulated by individual desire to strive to excellence (Theory Y) (Kopelman, Prottlas, Davis, 2008). In this scenario, the worker is inherently driven to either a motivational state and response according to their individual personal agenda. Does the worker share a desire to succeed or does the worker simply enjoy taking direction from superiors? How the individual responds in this role is the essence of human behavior. Having offered this, it would be somewhat irrational to suggest that the unconscious should only be the focus of study as it tends to omit the effect on the general environment. Missed deadlines, poor overall on-the-job performance, and other trappings of inferior, inherent ability must dictate a theory for the workplace manager. How best to motivate the unmotivated? Under McGregor’s theory of human behavior (and motivation), studying only the unconscious as a primary goal would not allow for solutions: Something which psychology provides as an entire field of study.Intelligence tests are capable of measuring human intellectual capacity and should be given similar regard in a variety of testing situations. Depending on the variety of testing instruments and the model by which it was constructed, human capacity might well be measured effectively.