Compare and Contrast Policy Paper Introduction The construction of two models by Herbert Parker in 1964 revolutionized the criminal justice system because most ideas in the system originated from the models (Roach, 1999, p: 671). This is because the models provide a useful way for coping up with the complex criminal justice process. What models did Herbert Parker introduce? According to Barkan and Bryjak (2011, p: 21), Parker introduced the “due process model and the crime control model in the system.” This paper uses the crime control and the due model as in place of the aforementioned models respectively. The models in question are still important to the criminal system today because they help in judging positive or actual operation of the system. Moreover, the models provide guidelines on the values used to influence decisions in criminal law.