CERTAIN SPECIFIC ASPECTS OF HYPOTHESIS TESTS USED FOR ANALYSIS OF RESULTS IN RANDOMIZED EXPERIMENTS WERE STUDIED--(1) THE DEVELOPMENT OF THE THEORETICAL FACTOR, THAT OF PROVIDING INFORMATION ON STATISTICAL TESTS FOR CERTAIN EXPERIMENTAL DESIGNS AND (2) THE DEVELOPMENT OF THE APPLIED ELEMENT, THAT OF SUPPLYING THE EXPERIMENTER WITH MACHINERY FOR ANALYSIS OF HIS RESEARCH. STUDIES OF RANDOMIZATION DESIGN CENTERED ON (1) THE COMPLETELY RANDOMIZED DESIGN, (2) THE RANDOMIZED BLOCK DESIGN, AND (3) THE REPEATED MEASURES DESIGN. THE RESULTS SUGGESTED THAT THE CONVENTIONAL F-TEST WITH A COMPLETELY RANDOMIZED DESIGN IS OPTIMAL AMONG THE THREE PROCEDURES STUDIED FROM THE STANDPOINT OF SIZE AND POWER. THUS, IT WAS DETERMINED THAT THE SIZE AND POWER OF F-TESTS UNDER PERMUTATION PROBABILITY BASES SHOULD AGREE CLOSELY WITH NORMAL THEORY VALUES. (GD)