This CFP is not appropriate for applicants who primarily seek funding to implement their proposed solution. Because S4A is a research program, grantees are expected to use all or most of their grant funding to carry out the research study, rather than to implement the proposed solution. Applicants who propose to use part of their grant funding to support implementation may be at a competitive disadvantage relative to other applicants, for several reasons: (1) these applicants will have fewer resources available to carry out a scientifically rigorous research study; (2) these applicants will have greater difficulty demonstrating the feasibility of their proposed solution, because implementation will depend upon receipt of grant funding; and (3) these applicants will have greater difficulty demonstrating the sustainability of the proposed solution beyond the end of the grant period.