Abstract
A series of studies were carried out to test Heider's theory in various interpersonal situations, both real and fictitious. Results obtained were found to differ consistently from what was predicted according to Heider's theory in some respects. Then a theoretical model which included his theory as its parts was proposed. The configuration composed of positive relations only was defined as the most stable one in the sense that the force to change the relationship among relations contained was minimum in it. Every configuration was postulated to tend toward it through four distinct tendencies: those to positivity, to symmetry, to consonance and to balance. Relationship among them was discussed.

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