Ability diversity or cognitive diversity: what yields the most accurate decision-making group?

According to a study published on the Information Science Journal, it was proven through unique empirical research that while ability diversity decreased group decision errors by approximately 4%, cognitive diversity was much more effective as team decision errors were reduced by approximately 13% thus putting into question the popular belief that reliance on using more capable members to create high performance homogeneous groups may lead to better team decisions. The final conclusion of the study was that a much better strategy is to create groups of members that ‘think differently’ and cooperate to produce a group decision

So, group composition really improves decision making? Certainly. Yet, the traditional approaches should be augmented. At a software tech firm, for example, forming coding teams that produce error free, innovative work would require more than just the lumping together of the brightest programmers and then setting them on a problem. It takes more diversity than that.

A good first step for our software firm would be to compose the group from, say, two bright computer programmers, two physicists, and two mathematicians. This would give you a group formed from members with diverse abilities. Yet, according to the new research, this would only reduce the team’s decision errors by about 4% because their cognitive abilities are still so similar.

What is needed is not only diversity of skills and high intelligence, but also diversity of thinking style. The most difficult trick of all turns out to be in identifying thinking styles. A good second step comes from the research of Professor Thomas Malone of MIT. Putting a few women on the team would improve the overall social sensitivity of the team thereby increasing its collective intelligence.

Questions to ponder:

• Is your organization postured to make savvy team decisions or is their effectiveness limited by lack of diversity (ability and cognitive)? 
• How does the composition of group membership differ between most accurate and least accurate decision-making groups? 
• Can you even identify your most and least accurate groups?

Here is an interesting and related video:

If you are struggling to find ways to identify thinking styles, one way is to examine management decisions.


The research article cited above: West, David, and Scott, Dellana. "Diversity of Ability and Cognitive Style for Group Decision Processes." Information Sciences 179 (2009): 542-58.33