Final answer:
To prevent groupthink, it is recommended to employ strategies that foster independent thinking and discourage conformity, such as brainstorming and keeping leaders' opinions in reserve until all members have shared their thoughts.
Step-by-step explanation:
An effective way to prevent groupthink is by using different strategies to improve group decision-making. These include seeking outside opinions, voting in private, having a group leader withhold their position statements until all group members have voiced their views, conducting research on all viewpoints, weighing the costs and benefits of all options, and developing a contingency plan. This approach addresses the causes of groupthink, such as high group cohesiveness, leader influence, and isolation from other viewpoints. Therefore, strategies like brainstorming can be effective because they encourage the sharing of diverse ideas without immediate judgment or pressure to conform.