This chapter considers how offenders and victims make use of space and how variations in their patterns of movement influence the occurrence of crime. It examines examples of individual offender decision-making, such as how past experience informs future decisions (both legitimate and illegal), and how individual activity patterns can influence the broader social processes that take place within the environment. It begins with an exploration of the fundamental theoretical frameworks upon which environmental criminology is based. It then discusses how these frameworks inform various aspects of our endeavor to understand crime, the particular benefits of each theoretical approach, and how they complement and contrast with one another. Particular emphasis is placed on how potential offenders, victims, and others use space, and how this impacts upon crime patterns. This is followed by discussions of specific areas related to offender mobility, namely the journey to crime and displacement.