 There are several different models which have been created, but they all demonstrate fidelity towards specific principles of the concept.For instance, the National Wraparound Implementation Center model of High Fidelity Wraparound specifies phases to the process of intervention with a family.It has a specific theory of change as well as a set of ten principles (family voice and choice, collaboration, team based, natural supports, community based, cultural competence, individualized services, persistence, strengths based, and outcomes based).