The Myers-Briggs Type Indicator (MBTI) is one of the most common personality assessments and a frequently used instrument for team development. However, in relation to team development processes, there is little research and literature on the role of personality in general and the usefulness of MBTI in particular. This article starts with a review of the MBTI and explores the relationship between MBTI profiles and team processes using a sample of 1,630 people working in 156 teams in a Swedish industrial organization. The results show that only a small number of MBTI personality profiles have a significant relationship with team processes. Overall, the composition of teams in terms of MBTI profiles does not seem to predict team development very well. Findings suggest that the MBTI may be used as an instrument for personal development and as a vehicle for group members to gain a better understanding of each other. © 2009 SAGE Publications.