Groupthink occurs when group members make group decisions and unanimously agree with each other and don’t make suggestions and concerns about the group's decision. Due to the poor results caused by groupthink, the purpose of this study was to find out the presence of this phenomenon in Slovenian public and private sector working groups, thus enabling organizations to avoid groupthink.The theoretical part uses a descriptive and comparative approach that summarizes the current findings of groupthink. The empirical section is based on a survey conducted between July and November 2019 following a quantitative methodological approach. A translated questionnaire was used to retrospectively identify whether predictors of groupthink were present when a poor decisions were being made by the group. The obtained data were analyzed with SPSS. The analysis found that Slovenian working groups are more vulnerable to groupthink than American ones and that the opinions of leaders differ from those of other employees regarding the presence of predictors when poor decisions were being made. It was also found that different length of time of a member’s operation in the group, different group sizes and gender diversity may indicate whether or not groupthink will occur in the group. The correlation and dependency between groupthink predictors have also been identified, showing how can groups maintain a moderate value of the predictors if they want to avoid groupthink. In doing so, organizations could improve their business, make better decisions, and increase employee satisfaction.
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