A component of the ecological systems theory developed by Urie Bronfenbrenner, the term microsystem describes the individuals, groups, and institutions that directly influence a child's development. Ecological systems theory proposes there are five environmental systems in which an individual will interact with over the course of their lifetime: microsystem, mesosystem, exosystem, macrosystem (hyperlink?) and chronosystem. The microsystem essentially are the things that are in the child's immediate surroundings and connections. Family, friends, peers, schools, religious groups, and neighborhoods are all part of the microsystem.