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Life-Course Perspectives and Their Influence on Crime Prevention Policy
Criminology · Chapter 9: Developmental and Life-Course TheoriesSection 9.4 · lesson 38 of 91video coming soon
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In this lesson
Classifying prevention, weighing its evidence, and avoiding its harms.
- Describe the standard classification of prevention approaches.
- Assess the evidence for life-course-informed prevention.
- Explain why programs fail on scale-up and how prevention can harm.
- Design a prevention approach for a described population.
Transcript
Everything said in the video, section by section (1,539 words). Read along, or search it.
Opening Question
One Budget, Many Competing Choices
An agency has one fixed budget for one community, and a long list of good ideas. Put it all into the most intensive program for the highest-risk young people? Or spread it thinner, across a whole life course? Every choice has a cost. By the end of this lesson, you'll be able to defend one with evidence.
Lesson Roadmap
From Developmental Findings to Policy
This lesson closes the chapter by turning developmental findings into prevention policy. You will learn the two standard ways of classifying prevention approaches, and how they overlap. You will assess the evidence for life-course-informed prevention, including its replication problem. You will see why programs with strong evidence can fail when they are scaled up. You will also learn how prevention itself can cause harm, through what are called iatrogenic mechanisms. Finally, you will meet an ethical framework, and the features of a defensible prevention portfolio. By the end, you should be able to design a prevention approach for a described population. And you should be able to defend each of its choices with evidence.
Two Schemes
Classifying Prevention by Target and Mechanism
Prevention approaches are classified in two overlapping ways. The first scheme is borrowed from public health, and classifies by who is targeted. Primary prevention is aimed at an entire population, before any problem has emerged. Secondary prevention is aimed at individuals or groups already showing early signs of elevated risk. Tertiary prevention is aimed at those who have already offended, to reduce further offending. The second scheme classifies by mechanism. Developmental approaches address individual and family development, and situational approaches address the immediate environment and opportunity. Community approaches address neighborhood conditions, and criminal justice approaches operate through the formal system itself. The two schemes overlap rather than compete, so a single program can be, for instance, both secondary and developmental at once.
Core Framework
Matching Approaches to the Four Windows
Developmental prevention is built around the four intervention windows from Subchapter nine point three. It represents this tradition's principal contribution to prevention policy. The claim is that intervening on early developmental conditions, rather than waiting for offending to emerge, offers the most durable path to reducing it. A standard prevention portfolio assigns an approach type, and a typical time to effect, to each window. Early childhood is developmental, with effects measured in years. The school transition combines developmental and situational approaches, also with effects over years. The adolescent transition combines community and situational approaches, with effects in months to years. And the reentry period combines criminal justice and developmental approaches, with effects within months. Notice that the earliest investments take the longest to show results.
Evidence Review
Early Intervention Results and Replication Problems
What does the evidence show? Long-term follow-up studies of early intervention programs have found measurable reductions in later offending. Participants offended less than comparison groups, in several well-documented cases. That evidence comes from evaluations published through the National Institute of Justice, and from academic longitudinal research. But the finding varies considerably from one program to another. The field has also faced a genuine replication problem. Results from a well-run original study do not always reproduce when the same program is delivered elsewhere. That limitation should be stated honestly, not glossed over. A program's reputation should rest on replicated results, not only on its original trial.
Scale-Up Problem
Why Strong Programs Falter at Scale
Why would a program with strong evidence underperform when it is expanded? Several factors explain it, connecting to the implementation concerns raised in Subchapter seven point eight. Fidelity is the degree to which the scaled-up version follows the original program's design. Staffing concerns the difficulty of recruiting enough people with the original staff's training and skill. Dose asks whether participants in the scaled version receive the same intensity and duration of service. Population difference asks whether the people served at scale match the population that generated the original evidence. Any one of these can quietly dilute a program. Together, they explain why scale-up so often disappoints. An evaluation that ignores them may wrongly conclude that the program's idea failed, when its delivery did.
Timescales
Combining Situational and Developmental Strategies
Developmental prevention operates on a much longer timescale than situational prevention. Situational approaches, introduced in Subchapter six point one, can alter immediate opportunity within weeks. A defensible strategy typically combines both. Situational measures manage risk in the near term. Meanwhile, developmental investment works toward reducing the underlying conditions that produce risk in the first place. Policy can also support desistance directly, beyond preventing onset, as Subchapter seven point six discussed. That includes record relief mechanisms, which limit the long-term consequences of a past record. It includes employment access free of unnecessary barriers, and available housing. And it includes practice that supports a person's identity shift away from an offending self-concept. That last element matches the turning-point mechanisms described in Subchapter nine point two.
Hidden Risks
Three Iatrogenic Mechanisms of Harm
Prevention itself can cause harm. The term for this is iatrogenic, meaning harm produced by the intervention meant to help. The concern connects to the labeling theories of Subchapters seven point five and seven point six. The first mechanism is labeling. Calling a young person at risk can itself contribute to the very outcome it names. The second is grouping. Putting higher-risk youth together in one intervention can concentrate negative peer influence, rather than reduce it. The third is intensity beyond need. That can subject a person to more supervision or restriction than their actual risk warrants, and that is a harm in itself.
Evaluation Criteria
Judging a Prevention Claim
Evaluating a prevention claim requires attention to three things. The first is the comparison group problem. Any observed difference must be measured against a genuinely comparable group, not an ad hoc contrast. Without that, a program can look effective simply because it served people who were already doing better. The second is a long follow-up requirement. Developmental effects may not appear for years, so a short evaluation can miss them entirely. The third is cost-benefit framing, with its assumptions made visible. For example, how are future costs and benefits valued, relative to present ones? Those choices can change the verdict, so they should be stated, rather than left implicit.
Program Examples
Home Visiting, Mentoring, and Reentry Employment
Here are six programs, each classified both ways at once, with its main evaluation difficulty. A universal home-visiting program is primary and developmental, and needs a long follow-up to show effects. Targeted school-transition mentoring is secondary and developmental, and needs a comparison group matched on early risk. Reentry employment support is tertiary and criminal justice, and faces selection effects among those who enroll voluntarily.
Program Examples
Design, Youth Engagement, and Family Reentry
Environmental design in public space is primary and situational, with possible displacement to nearby areas, a topic Subchapter ten point six returns to. A neighborhood youth engagement program is secondary and community, building collective efficacy locally. Its difficulty is separating the program's effect from other neighborhood change. Family-based reentry support is tertiary and developmental, restoring a bond disrupted by incarceration, though at that stage, small sample sizes limit statistical power.
Ethical Framework
Commitments of a Defensible Portfolio
A defensible prevention approach rests on three ethical commitments. It keeps the intensity of intervention proportional to the strength of the evidence supporting it. It secures genuine consent, wherever the population served can meaningfully give it. And it preserves the line between offering an opportunity and imposing supervision. A voluntary program is an offer, while supervision carries restrictive consequences regardless of the person's wishes. Taken together, a defensible portfolio has three features of its own. It spans all four life-course windows, rather than concentrating resources at a single point. It combines developmental and situational approaches, so that it works across different timescales. And it builds in evaluation from the outset, rather than assessing effectiveness only after full-scale rollout.
Return to Case
Allocating the Agency's Fixed Budget
Now back to the agency from the start, with its fixed annual budget for a single community. It must allocate that funding across all four life-course windows. The agency's task is to reason through the trade-offs between the windows. One option will be especially tempting: the most intensive, highest-visibility program. Such a program concentrates resources on a small group of flagged individuals. The agency has to weigh that appeal against its iatrogenic risk. Labeling is one part of that risk. Overinvestment in a few flagged people, relative to a broader, lower-intensity portfolio, is the other. Everything in this chapter, from the prediction problem to the four windows, bears on that one decision.
Quick Check
Classifying Second-Grade Tutoring by Target
Quick check, with a new case. Tutoring and family coaching go only to second graders who already show aggressive behavior. Primary, secondary, or tertiary? Pause, and decide.
Check Answer
Secondary Prevention Fits Early Risk
Secondary prevention. It targets children already showing early signs of elevated risk: not the whole population, and not people who have offended.
Quick Check
Identifying the Harm in Group Counseling
Quick check. Two sets of equally flagged teens get the same weekly counseling. One set meets one on one; the other meets all together. A year later, only the set that met together is offending more. Which iatrogenic mechanism fits best? Pause, and decide.
Check Answer
Grouping Concentrates Negative Peer Influence
Grouping. Both sets carried the same label and the same dose, so the difference is the peer mix: putting higher-risk youth together concentrates negative peer influence.
Key Takeaways
Chapter Recap and Road to Violent Crime
To recap. Prevention can be classified by who is targeted and by mechanism, and the two schemes overlap. The evidence for early intervention is real, but replication is uneven, and scale-up can dilute a program. Prevention itself can cause harm, so a defensible portfolio spans the windows, respects consent, and builds in evaluation. This closes Chapter nine, and the chapters that follow turn to specific offense categories, beginning with violent crime in Chapter ten.
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