Compare and contrast determinate vs. indeterminate sentencing models. Of the two, which do you believe is more effective in reducing recidivism rates?

Sentencing philosophies and models are created by legislatures and imposed by courts. However, it falls upon our nation’s correctional institutions to administer the punishment defined by legislatures and imposed by courts.
In your initial post, compare and contrast determinate vs. indeterminate sentencing models. Of the two, which do you believe is more effective in reducing recidivism rates?