The MBTI (Myers-Briggs Type Indicator) Step II™ instrument is based on the work of C.G. Jung’s theory that different psychological types perceive the world and make decisions in different ways.  Katharine Cook Briggs and Isabel Briggs Myers elaborated on the theory to create a four letter personality designation. The MBTI™ enables individuals to better understand his/her self and others on teams, in communication, during conflict and in leadership roles.