Two-Step Flow Communication Theory By Paul Lazarsfeld

BACKGROUND 
Paul Lazarsfeld born in Viena Austria, 13 February 1901. Lazarsfeld got Ph. D in mathematics in 1925. In 1929 he founded a research institute in Vienna to apply social psychology. Lazarsfeld came to the United States in 1933 and acted as a director in the Office Radio Research at Princeton University. Then Lazarsfeld died in New York in 1976. He is also a professor at Columbia University.

In his research on the two-step flow Lazarsfeld helped by many colleagues who named Elihu Katz. Katz, who was born May 31, 1926, he also obtain a Ph.D. 

ESSENCE THEORY 
This theory has the fundamental assumption that the effects of mass media on society not directly but through an intermediary that opinion leaders (opinion leaders). 
This theory states that the information coming from ....
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