The teen pregnancy prevention programs (i.e., Tier 1 TPP and state formula and competitive
PREP) are federally mandated to replicate evidence-based programs. Tier 2 TPP and PREIS are
mandated to implement innovative strategies to prevent teen pregnancy and STIs. Both the TPP
program and PREP provide funding for evaluation. Replication of programs and evaluation of
new programs will add to the evidence base regarding what works and what does not work with
regard to teen pregnancy prevention.87
OAH supports several evaluation activities to continue to build the evidence base for what works
to prevent teenage pregnancy. OAH currently provides funding to 35 Teen Pregnancy Prevention
(TPP) grantees to conduct an independent, rigorous evaluation of their programs; 16 grantees are
evaluating their efforts to replicate evidence-based programs and 19 grantees are evaluating new