Michael Beecher, a professor of psychology and biology at the University of Washington, developed the hypothesis in the 1980's that social group size predicts individual differences.

Stress should be laid on the application of the theory of Krashen s input hypothesis in practical English text teaching.

At the same time of affirming man′s pursuit of interest, Empiricism leads the realization of moral value to the respect of the rules of social morals by hypothesis.