Traditionally, assessment relied heavily on the technical knowledge and manipulative skills of individual pilots. Modern airlines now further expand these measures to include Crew Resource Management (CRM) skills. The recent introduction of 'non-technical skills' has aided in making these CRM skills more explicit. However for grade integrity, a thorough understanding is required of how the categories within non-technical skills are related. This presentation reports on research that has reviewed the interrelationship of technical and non-technical skills of pilots undergoing initial command training.