Research on mental health service engagement has been dominated by attempts to identify determinants of engagement. Such knowledge is important but incomplete. Once identified, program designers need to use evidence-based principles to design programs to bring about changes in the empirically identified determinants. Research is relatively silent on such principles. This article develops a framework to guide program designers’ as they address factors that constrain and/or facilitate engagement. The framework is grounded in communication theory and evidence from related behavioral science research. The literature is summarized and used to generate a check-list of questions to consider when structuring engagement programs.