Justifications for the development of special correctional pro
grams and for the choice of sentencing disposition for an
individual offender are frequently based on claims of greater
rehabilitative efficacy. While considerable evidence exists that
some types of offenders have relatively more or less likelihood
of recidivism than others, there is, as yet, almost no evidence
that available correctional alternatives have any impact on those
likelihoods. The article reviews findings from studies of correc
tion in California for five critical choices in offender process
ing : (1) imprisonment or probation, (2) length of stay in prison, (3) treatment program in prison, (4) intensity of parole or
probation supervision, and (5) outright discharge from prison
or release on parole. The authors conclude that variations in
recidivism rates among these alternatives are, for the most part, attributable to initial differences among the types of offenders
processed and that the remaining differences in violation rate
between programs may be accounted for by differences in inter
preting an event as a violation or in officially designating it as
such. No evidence was found to support claims of superior re
habilitative efficacy of one correctional alternative over another .