How does individual deterrence try to prevent a convicted person from reoffending?

Individual deterrence is a theory of punishment specifically directed at the person who has committed an offense, with the primary goal of teaching that individual not to repeat their criminal behavior. By imposing a penalty, the legal system aims to discourage the offender from engaging in further misconduct.1

This approach is rooted in the principle that punishments should be proportionate to the gravity of the crime. If penalties were uniform regardless of the offense, there would be no incentive for an offender to choose a lesser crime over a more severe one.1

Measuring the effectiveness of individual deterrence is complex. While researchers often look at whether an offender is reconvicted, this metric can be misleading because many crimes do not result in a conviction. Furthermore, it is difficult to isolate the impact of a specific punishment from the natural tendency of individuals to "age out" of criminal behavior as they move past their late teens and early 20s. While individual deterrence focuses on the offender's future conduct, it remains distinct from rehabilitation, which seeks to reform the individual through treatment and training.12