Which of the following is NOT considered a major pitfall of group decision making?

Leadership dominance is not considered a major pitfall of group decision-making because it focuses on the influence a single leader may have over the group's decisions rather than the dynamics and interactions among group members themselves. The other options represent phenomena that can negatively impact group decision-making by leading to poor outcomes or unreasonable consensus without proper evaluation of alternatives.

Groupthink reflects a situation where the desire for harmony within a group leads to a lack of critical evaluation of alternatives, resulting in poor decision-making. The Abilene paradox occurs when a group makes a decision that is counter to the preferences of its individual members, often due to a failure to communicate opinions. Group polarization is the tendency for group discussions to lead to decisions that are more extreme than the initial inclinations of its members, often amplifying risky or cautious decisions.

In contrast, while leadership can influence decision-making styles, it is the group dynamics, consensus processes, and communication patterns that are more directly related to the pitfalls categorized in decision-making research.