Celebrating 50 Years of the Thomas-Kilmann Instrument (TKI) 

Since 1974 (when this assessment was first published), 10 million TKIs have been sold worldwide!

Kilmann Diagnostics Offers You the Most

Informative Resources for Celebrating the

TKI’s 50th Year

If you want to read the most up-to-date and comprehensive information about this assessment tool in one single document, consider purchasing Ralph Kilmann’s TKI Book (just published in June 2023): Mastering the Thomas-Kilmann Conflict-Mode Instrument: Celebrating More Than 50 Years of Resolving All Kinds of Conflicts.

You can purchase the hardcover version of Dr. Kilmann’s TKI Book:

Cover TKI Book

More About
Ralph Kilmann’s
2023 TKI Book

In Ralph’s 2023 TKI book, he first discuss the TKI Conflict Model, its two underlying dimensions, the five conflict-handling modes, and the three diagonal dimensions that enable a deep interpretation of your or anyone else’s assessment results.

Next, Ralph examines the eight key attributes of a conflict situation (e.g., the level of stress, the level of trust, the relative importance of the issue to both parties, etc.), which determine when to choose—and how to use—each one of the five conflict-handling modes: competing, collaborating, compromising, avoiding, and accommodating.

Ralph then demonstrate how to conduct an in-depth interpretation of six very different assessment results. Afterwards, each person can then use their personalized TKI results to significantly improve their conflict-handling behavior.

Click on the section below in order to see the full Table of Contents, which thus reveals the remaining chapters and discussions in Ralph’s 2023 Book:

Click to see the Table of Contents

Mastering the Thomas-Kilmann Conflict Mode Instrument —TKI—


List of Illustrations


Chapter 1: The Thomas-Kilmann Conflict Model

Two Underlying Dimensions,

Five Conflict-Handling Modes,

Three Diagonal Dimensions

Chapter 2: When to Use Each Conflict-Handling Mode

Assessing the Eight Key Attributes of a Conflict Situation

Chapter 3: Interpreting Six Different TKI Profiles According to the TKI Conflict Model

Chapter 4: Vital Distinctions for Better Understanding and Using the Five Conflict-Handling Modes

Chapter 5: Addressing the Unique Validity & Reliability Issues for the Thomas-Kilmann Instrument 59

Chapter 6: Taking the TKI Assessment Tool with Either the Standard or Modified Instructions

Chapter 7: Identifying and Resolving the Systems Conflicts Between Members and Their Organization

Chapter 8: Presenting the New TKI Team Report

Identifying Challenges and Remedies for Resolving Conflicts in Groups and Teams

Chapter 9: The 50-Year History of the Thomas-Kilmann Instrument

From Conception to the Present

Chapter 10: The Most Frequently Asked Questions About the Thomas-Kilmann Instrument

Chapter 11: Using the TKI Conflict Model to Address Your Four INNER Conflicts

Integrating Your Ego, Soul, Systems, and Your Primal Relationships All Within a Physical/Energy Body

Chapter 12: Using the TKI Assessment Tool with the TKI Conflict Model in Many Situations

Key Insights and Lessons Learned

Chapter 13: Using the Myers-Briggs Type Indicator with the Thomas-Kilmann Instrument

Magnifying and Resolving Differences

Chapter 14: Civil Wars & International Wars

Facing—and Resolving—Our Most Devastating Conflicts



About the Author

Rear Cover of the TKI Book

A Summary of the
Entire History of the
TKI Assessment Tool

Check out Ralph’s popular retrospective: “A Brief History of the Thomas-Kilmann Conflict Mode Instrument (TKI).” This article summarizes the entire history of this assessment tool, starting with its creation in the early 1970s, including the most important subsequent research on the instrument’s reliability, validity, and novel uses… far beyond its initial focus on interpersonal conflict.

Online Thomas-Kilmann Instrument

The Best Tips for
Using the TKI Tool
Most Effectively

For the TKI’s 50th Anniversary Celebration, Ralph updated a previous article on the TKI: “16 Tips for Using the TKI Tool for Developing People and Facilitating Conflict Management.”  This article is the most concise summary for using this assessment tool most effectively in all kinds of conflict situations.

Cover of 16 Tips

Resources for
Learning More
About the TKI and
Conflict Management

Here are a total of  35 ARTICLES and 65 BLOGS and 20 VIDEOS about the Thomas-Kilmann Instrument. And here are the classic 12 FAQs About the TKI Assessment … with Dr. Kilmann’s thoughtful answers.

Podcast with Pete Mockaitis

Take Our Three TKI-Based Online Courses to Earn Your TKI Certification

If you want to learn more about conflict management and the Thomas-Kilmann Instrument, you can purchase and take any one of the three separate online courses: BASIC Training, GROUP Training, and ADVANCED Training in Conflict Management.

If you want to become TKI Certified, you can purchase and take The TKI Package of all three online courses on conflict management and then pass the three Final Exams.

The Thomas-Kilmann Instrument Package of Courses