Working together harmoniously in an engineering team is crucial to achieve success and is essential to the team members' wellbeing. This study examines what types of personalities hinder the harmony across engineering teams and explores how to maintain harmony across engineering teams with diverse personalities. Consequently, the data is collected from experienced engineering team leaders as well as an experienced psychologist. This study shows that in the engineering industry personalities are looked at from a different perspective and their characteristics are perceived from a business point-of-view as opposed to the literature in which judgments are made upon the personality description.