An overarching term describing the interconnectivity and interdependence of parts within a system, such as the relational connecting of family members, or of members of an organisation. The term can equally be applied at micro and macro levels: the interconnectivity of neurons at a micro level or at a macro level, the interconnectivity of aspects of culture within society. In systemic theory, changes in one part of a system result in a shift, in some way, of other parts. Thus change within a family can result from changes in any one or more parts of the system and contexts (macro) within which that family functions. A therapist meeting with a family therefore automatically brings a shift in the system in some way. The therapist cannot be seen as separate to the system and therefore cannot be objective.