How do these programs work to reduce juvenile crime? What are the problems major goals, objectives and core tenets?

How do these programs work to reduce juvenile crime?
What are the problems major goals, objectives and core tenets?
How do community based programs address issues related to juvenile gang violence?
What is the role of law enforcement in these programs?
Who are the key participants in these programs?
What services do they provide to juveniles?
Which of the two programs is more effective at reducing juvenile crime? Why
Comparing two juvenile division, intervention or prevention programs operating in your city or state. My state is California and the city is long beach.