Reconceptualizes groupthink symptoms as observable group interaction patterns. Proposes two coding systems for detecting the illusion of unanimity symptom, detecting both degree of unanimity and degree of the illusory versus substantive nature of that unanimity. (SR)

Focuses on personality as a predispositional factor which is predictive of the direction of both persuasive argumentation by group members and, subsequently, decision shifting. Tends to validate the value theory of polarization by showing that persuasive argumentation can mediate the effect of personality on decisional shifting. (PD)