Learn about how one university library measured the effects of first-time-college students’ library use on their success outcomes. Apply these same approaches to more confidently measure the effects of library programs on offender outcomes in correctional settings. Using Generalized Propensity Scoring (GPS) and/or Precision Matching (PM) you can hone in how your library program affects your participants and rule out other factors that may have affected the result. For example, you want to measure the effectiveness of a literacy program on preventing first-time offender recidivism while controlling for their background educational level and family income.