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)

Findings suggest, among others, that argumentativeness is an important variable in the perception of leadership, with the highly argumentative individual chosen leader over the moderate or mildly argumentative individual. Highly argumentative individuals were also rated as more influential on the group's decision. (PD)

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)