The cognitive diversity of group members, which refers to differences in thought process and ideas, is also an important factor for performance. A moderately cognitively diverse group has higher CI than both a low diversity group and a high diversity group. This suggests that too much similarity between group members impedes performance as there is a lack of different perspectives and skills, but too much diversity also impedes performance as group members struggle to communicate and coordinate effectively. A moderate level of cognitive diversity is therefore best for increasing collective intelligence. Overall, individual traits and skills that enhance the group’s ability to collaborate or bring an appropriate amount of new perspectives promote collective intelligence.