Sociology is the systematic study of human behavior and society. The sociological imagination as described by C. Wright Mills refers to understanding the relationship between personal experiences and wider social influences. Functionalism views society as a complex system whose parts work together to promote solidarity and stability, like the way organs work to keep a living organism functioning. Key figures in the development of functionalism include Emile Durkheim, who studied how social order and values influence suicide rates, and Talcott Parsons, who sought a grand unified theory of social systems and structures. Robert Merton argued for empirical testing of more focused assumptions rather than abstract grand theories.