The Thomas-Kilmann Conflict Mode Instrument (TKI) is the world's best-selling assessment for understanding how different conflict-handling styles affect interpersonal and group dynamics.

The TKI is a fast, simple tool that provides practical, situation-specific approaches to dealing with conflict effectively. Available in online and self-scorable formats, it can be used in combination with the Myers-Briggs Tybe Indicator® (MBTI®) assessment to gain further insight into the connection between personality and conflict. Its applications include management and supervisory training, negotiation training, team building, leadership development and safety training.

The TKI measures preferences for five different styles of handling conflict, called conflict modes: Competing, Collaborating, Compromising, Accommodating, and Avoiding. The five modes are described along two dimensions - assertiveness, or the extent to which one tries to satisfy his or her own concerns; and cooperativeness, or the extent to which one tries to satisfy the concerns of another person: