DISC is one of the longest-running and most widely used behavioral assessments. It identifies observable behavioral/genetic traits that impact how a person communicates and responds. TTI's version is probably one of the most revealing assessments in the market today. It is commonly used for line and management employees to identify job fit and improve team synergy through understanding communication styles.
Versions available are (1) Management-Staff, (2) Sales, (3) Executive, (4) Customer Service (5) Interviewing Insights, (6) Communicating with style, and (7) Team Building