Programs are generally assigned either a Proven or a Promising rating, depending on whether they have met certain evidence criteria.
Some programs are identified as Screened Programs. These programs have not undergone a full review by PPN, but evidence of their effectiveness has been reviewed by one or more credible organizations that apply similar evidence criteria.
The PPN site is always a work in progress. We are currently evaluating many programs that do not yet appear on the site. Those which meet our criteria will be posted as soon as possible.
To recommend a program for consideration, write to 
Indicator: Youths abstaining from sexual activity or not engaging in risky sexual behavior
Promising Programs
Postponing Sexual Involvement/Human Sexuality Educational Series
Seattle Social Development Project
Proven / Promising Programs
Screened Programs
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