DISC is a personal assessment tool used to improve work productivity, teamwork and communication. DiSC is non-judgmental and helps people discuss their behavioral differences. One of the key properties of the DISC model is the fact that it is based on observable behavioral characteristics. The DiSC model provides a common language that people can use to better understand themselves and to adapt their behaviors with others. This can be within a work team, a sales relationship, a leadership position, or other relationships.