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The theory of the problem is also called logic model of the problem (Dalager et al., 2019). It presents a systematic articulation of the health problem requiring remediation. Health problems are experienced in different domains of health, in different ways, by different clients presenting with different personal and health profiles. The problems are brought about, caused, or influenced by a range of factors operating at different levels, in different contexts. This heterogeneity or variation in experience demands a clarification of the health problem as encountered in the clients' circumstances or contexts (Butner et al., 2015; Leask et al., 2019). The theory of the problem is a middle range theory that provides a comprehensive conceptualization of the health problem requiring remediation. The theory defines the problem, identifies influential factors, and explains the relationships among them, that is, how the factors contribute to the problem. The theory can also specify possible consequences if the problem is not addressed.