Abstract This essay covers some of the most important aspects of criminal behavior theories and delves into the lesser, supporting theories pertaining. The assignment question/instructions were: In a 1-2 page well constructed essay, discuss the major differences between the various theories which are used to explain criminal behavior? What theory in your opinion best explains this? The answer to the last question is very hard to determine. I have likes and dislikes of each of the theories mentioned. Though the theories contradict in some ways, taking certain parts and points of each of the mother theories could be combined to provide another. Criminal Behavior Theories There are many different theories available to use when trying to explain criminal behavior. Why commit a crime? Why commit this crime? Why commit a crime this way? At this time? The explanation could be simple or complex, various or straight-forward. One of the most popular theories to explain criminal behavior is the “Rational Choice Theory”. This theory attempts to determine the who, what, when, where, how, and why of criminal behavior. Although the most popular theory, Rational Choice Theory is but one of many theories that seek to understand this. Each theory has certain concepts that are vital to supporting the theories’ ability and success. The subject of this paper is to determine and define the major differences in these various theories. Rational Choice Theory This theory is based around the principle that an individual’s behaviors and choices are influenced by what he/she reasons is the “means and ends” or “cost and benefits” in regards to criminal activity. In short, the criminal activity that an individual chooses to act on, is a decision made based on the risk, consequences, and benefit to them. The development of this theory is identified with Italian social philosopher Cesare Beccaria, who lived from 1738 to 1794. A treatise by him called “On Crimes and Punishment” contained the basic beliefs and concepts that later formed this theory. Today, one of the basic concepts of rational choice is criminal behavior is the result of an individual’s thought and planning. Criminals choose to commit a crime after selecting targets, and showing their behavior to be systematic and selective. The individual commits the crime because he/she believes the benefits outweigh the risks. Theorists of rational choice view crime as offense, and