Fascinating research here on the usefulness of team decision-making versus independent decision-making based on similar variables:
As counterintuitive as it seems, increasing the number of people involved in a difficult decision will likely decrease decision-making quality. Whatever unique knowledge individuals could offer to deliberations often goes unshared or disregarded. When decision-making stakes are high, don’t let your valuable UX insights fall victim to the common-knowledge effect. Be a vigilant team facilitator to ensure that all of us are at least as smart as each of us.