diversity among team members can produce negative perceptions of the team itself as well as of individual contributions in the perspective of team leaders. This was discovered when contrasting the effect of measuring team fit and team attraction by extraversion (measure on a scale of high individual/low team to low individual/high team) versus overall personality. Increased similarity in extraversion levels lead to greater attraction to one's team; it has been repeatedly proven that increased allegiance and attraction to a team within an organization improves performance as well as the perception of their performance by colleagues and management. Creativity Many teams are employed within organizations not just to join skill sets (e.g. a team of specialists within a hospital) but to find a more creative solution than any individual would be able to come up with and execute on their own (see organizations like IDEO). Creativity has the particular issue of being difficult to measure and peer review simply because there can be so many particular manifestations of creativity on an individual to individual basis. Diversity of creativity itself has not been extensively explored, perhaps for lack of real world applications. However, the effect of creativity itself on the other aspects of diversity within a team has serious implications. Cognitive diversity among members has been found to have a negative effect on intrinsic motivation among team members. However, relatively recent research has shown that this depletion of motivation is counteracted if members of the team would rate themselves highly on creativity. Note that this effect is not found for actual measured creativity, but for team members whose creative self-efficacy was on the higher end. A large-scale meta-analysis found that diversity among team members in terms of demographic variables such as race/ethnicity, age, and sex is unrelated to team creativity and innovation. It also found that diversity in terms of job-related factors such as functional diversity, educational background diversity, and team tenure diversity is positively related to team creativity and innovation. Functional diversity Functional diversity of team members refers to the different functional backgrounds, skills and abilities of members within a team. This increases the pool of knowledge and skills available for completing team tasks. Especially in decision-making tasks, research shows that functionally diverse teams tend to make better decisions because they hold a greater variety of perspectives (see Decision-making in Teams). An important drawback to consider is that functionally diverse teams