In today's society, many people commit crimes and illegal behavior is nothing new. Society knows that criminals exist and that they have criminal intentions. The question today is not whether people will commit crimes, but rather finding the most effective method to help these criminals re-enter society as productive citizens and prevent new people from becoming criminals. . Corrections across the country have implemented a program that identifies the most effective method. The “what works” movement describes four general principles that are implemented in the rehabilitation of criminals: and these principles are the risk principle, the criminogenic need principle, the treatment principle and the fidelity principle. First, the risk principle focuses on high-risk criminals who are likely to reoffend. This principle should match the level of intervention to the offender's level of risk. As Van der Knaap, Alberda, Oosterveld & Born write: “The need principle suggests that interventions should address dynamic risk factors – or criminogenic needs – because they are aspects of a person or their situation which, when modified, are associated with changes in the risks of recidivism. (Van der Knaap, Alberda, Oosterveld & Born, 2012, p. 413) » High-risk criminals are targeted by this program after being assessed for their risk. Criminals of this principle undergo intensive treatment. It is not effective to use this principle with low-risk criminals because it is likely to cause more harm than benefit. Of course, the risk principle is effective for high-risk criminals. However, it should not be used for low-risk offenders, as it risks placing low-risk offenders in the same areas as high-risk inmates. Then the bottom...... middle of paper......(2004). Apply principles of effective intervention to juvenile correctional programs. Corrections Today, 66(7), 26-29. Retrieved from http://ehis.ebscohost.com.proxy-library.ashford.edu/eds/pdfviewer/pdfviewer?sid=4bd9d7f2-8ac5-42c6-a100-a2443eda9cbf@sessionmgr4002&vid=1&hid=4213Van der Knaap, L., Alberda , D., Oosterveld, P. and Born, M. (2012). The predictive validity of the criminogenic needs of male and female offenders: comparison of the relative impact of needs in predicting recidivism. Law and Human Behavior, 36(5), 413-422. Retrieved from http://ehis.ebscohost.com.proxy-library.ashford.edu/eds/pdfviewer/pdfviewer?sid=5dc33823-1541-4e10-9ac6-36b6fbb83bbf@sessionmgr4003&vid=3&hid=4203Wright, J. (2012). Introduction to criminal justice. (p. 9.1). San Diego: Bridgepoint Education, Inc. Retrieved from https://content.ashford.edu/books/AUCRJ201.12.1/sections/sec9.1