- The goal of this research was to compare team effectiveness with objective team success as seen through individual team members’ perceptions in academic and athletic teams. We hypothesized that successful teams are most often strong in team effectiveness, that individual perceptions of team effectiveness can differ among teammates, and that athletic and academic teams share a similar correlation between team effectiveness and objective team success. This study used the Team Effectiveness Questionnaire developed by the London Leadership Academy, which allowed us to quantify team effectiveness. Eligible participants included Oregon State engineering students who completed ME 382 Introduction to Design and student-athletes from the 2019/2020 OSU gymnastics team. For the engineering students, success was measured by rankings in the end of term competition. For the gymnasts, success was measured by NCAA team rankings and team scores from three different competitions throughout the 2020 season. Our results show that teams with strong team effectiveness are sometimes objectively successful, but not always. In several instances, engineering teams were strong in team effectiveness but performed poorly. In contrast, the OSU gymnastics team was consistently strong in team effectiveness and objectively successful throughout their competition season.