Most criminal acts worldwide start with the intent for a crime to be committed, which is premised on the idea that intentionality must be revealed when determining that a criminal act has taken place. Because we are unable to know the intent of others, however, intent can cause errors within the criminal act; for example, revealing guilt based on the criminal act means making a rational judgement befitting of evidence and logic, rather than determining the existence of intent. If modern criminal investigation focuses on the type of crime, then it should be concerned with what punishment to allocate and to what degree. This book examines errors that the principle of an essential intent of crime causes in the criminal act by focusing on crimes of robbery and rape. This book also contemplates what role intent should assume in the criminal act, and explores the perspective that a criminal act is based on the intellect, experience, and views of another person.