Human ecology: A sociological perspective that emphasizes the relationship among social order, social disorganization, and the distribution of populations in space and time. It bases on the community, and is mainly concerned with population growth and change ; it seeks to discover how society organize themselves to survive and prosper and how groups compete and cooperate among them.
Interactionism: A sociological perspective that views social order and social change resulting from all the repeated interactions among individuals and groups. It divides on two approaches: Rational choice, which focuses on exchange and choice, and how can social order and stability exist when people have selfish motives and is always looking after their benefit; Symbolic interactionism, which focuses on how people communicate and finally arrive at mutual understandings.
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