Urie Bronfenbrenner was generally regarded as one of the world's leading scholars in the field of developmental psychology. His ecological systems theory holds that development mirrors the influence of several environmental systems, and it categorizes five environmental systems with which an individual interacts; Microsystem, Mesosystem, Exosystem, Macrosystem, and Chronosystem.
Microsystem: Refers to the institutions and groups that most immediately and directly impact the child's development including: family, school, religious institutions, neighborhood, and peers.
Mesosystem: Refers to relations between microsystems or connections between contexts. Examples are the relation of family experiences to school experiences, school experiences to church experiences, and family experiences to peer experiences. For example, children whose parents have rejected them may have difficulty developing positive relations with teachers.
Exosystem: Involves links between a