One model for program design is the [[Ecosystem model|socio-ecological model]]. This model enables an understanding of the factors that can infulenceinfluence a community. It demonstrates five levels of influence, which are the individual/intrapersonal, the interpersonal, the organizational/institutional, the community, and the policy.<ref>{{cite web|author1=Healthy Teen Network|title=Increasing Our Impact by Using a Social-Ecological Approach|url=http://www.healthyteennetwork.org/wp-content/uploads/2015/06/TipSheet_IncreasingOurImpactUsingSocial-EcologicalApproach.pdf|page=1, 2-3|accessdate=10 May 2017|date=March 2015}}</ref>
