 The social navigation hypothesis calls instead for analysis of the depressive's talents and dreams, identification of relevant social constraints (especially those with a relatively diffuse non-point source within the social network of the depressive), and practical social problem-solving therapy designed to relax those constraints enough to allow the depressive to move forward with their life under an improved set of social contracts.This theory has been the subject of criticism.It has been hypothesized that depression is an evolutionary adaptation because it helps prevent infection in both the affected individual and his/her kin.