Developed by psychologist William Moulton Marston, the DISC assessment examines how an individual ranks in the four primary personality types – dominance, influence, steadiness and conscientiousness. Everyone has these four characteristics, but the strength of each varies depending on the person. None of the DISC personality traits are inherently positive or negative. The test and results are nonjudgmental and help those who take it respond to conflict, resolve problems and discover what lies behind their common habits or working styles. More than two million people have taken the 15-minute DISC assessment to better understand their personality type and behavioral style. The test is designed for both individuals who want to identify and maximize their strengths and motivators, and organizations that want integrate high-performance teams. Tony Robbins uses the DISC assessment in his hiring practices.