In 1982 the John D. and Catherine T. MacArthur Foundation created a
small committee-the Justice Program Study Group (whose membership is
listed at the end ofthis preface)-and posed to it what can hardly be
regarded as an easy ques- tion: "What ideas, what concepts, what basic
intellectual frameworks are lack- ing" to understand and to more
effectively deal with crime in our society? Those who are acquainted
with the work of the members of the Study Group will appreciate how many
divergent views were expressed-divergent to the degree that some of us
came to the conclusion that we were not a Study Group at all but rather
a group being studied, an odd collection of ancient experimental animals
serving some dark purpose of the Foundation. Eventually, however, a
surprisingly strong concurrence emerged. We found we were impressed by
the extent to which in our discussions we placed heavy reliance on the
products of two types of research: first, those few longitudinal studies
related to juvenile delinquency and crime that had been pursued in this
country and, second, a few experimental studies that had sought to
measure the consequences of different official interventions in criminal
careers. These two research strategies had taught us much about crime
and its control. Other strategies-case studies, cross-sectional surveys,
participant observations, and similar techniques-had indeed been
productive, but it was the longitudinal and experimental designs that
firmed up the knowledge that the others helped to discover.