Answer:
Micro-system
Explanation:
Urie Brenner's proposed a theory called the ecological theory. The micro-system is the fist stage of ecological theory. It is the basic stage of the theory. This stage describes the basic concepts of individuals, groups, institutions, friends, peers, etc. This system directly influenced the development of children. The ecological theory has five systems in it. The micro-system is the initial stage of children's development such as their peer group, parents, schools, friends, etc.