# The Myers-Briggs Company > The Myers-Briggs Company is the global publisher of the Myers-Briggs Type Indicator® (MBTI®), Thomas-Kilmann Instrument® (TKI®), FIRO®, CPI 260®, and Strong Interest Inventory® assessments. The MBTI assessment was developed by Katharine Cook Briggs and Isabel Briggs Myers, based on Swiss psychiatrist Carl Jung's theory of psychological types, and first published in 1962. It is backed by more than 75 years of research and is the most widely used personality assessment in the world. The assessment is designed for individual development and self-awareness, not for selection or hiring. This site serves organisations, HR and L&D leaders, coaches, and consultants seeking practitioner certification and assessment-based solutions for leadership development, team effectiveness, conflict management, and career development. For individual MBTI assessments for personal use, see mbtionline.com. ## Certifications Certification is required to administer and interpret these psychometric assessments professionally and ethically. Programs are delivered virtually and in person across the US, UK, Europe, and Asia-Pacific. - [Training & Certifications Overview](https://www.themyersbriggs.com/en-us/get-certified/certification-overview): Hub page covering all practitioner certification programs across the MBTI, TKI, FIRO, CPI 260, and Strong Interest Inventory assessments. - [MBTI Certification](https://www.themyersbriggs.com/en-us/get-certified/mbti): Overview of MBTI Certification options for becoming an MBTI Certified Practitioner, qualified to administer and interpret the Myers-Briggs assessment in line with the ethical use guidelines of the Myers & Briggs Foundation. - [MBTI Public Certification (Instructor-Led)](https://www.themyersbriggs.com/en-us/get-certified/mbti/public-certification): Live instructor-led MBTI Step I™ certification delivered virtually or in person on scheduled cohort dates. - [MBTI Self-Guided Certification](https://www.themyersbriggs.com/en-us/get-certified/mbti/self-guided-certification): Flexible self-paced MBTI Step I™ certification for practitioners who prefer asynchronous learning. - [TKI Certification](https://www.themyersbriggs.com/en-us/get-certified/tki): Certification in the Thomas-Kilmann Instrument for conflict management, used by managers, HR, and OD practitioners to assess and develop conflict-handling skills. - [FIRO Certification](https://www.themyersbriggs.com/en-us/get-certified/firo): Certification in the FIRO-B® and FIRO Business® assessments, which measure interpersonal needs in inclusion, control, and affection. - [CPI 260 Certification](https://www.themyersbriggs.com/en-us/get-certified/cpi): Certification in the California Psychological Inventory 260, a personality assessment used for leadership development and executive coaching. - [Strong Interest Inventory Certification](https://www.themyersbriggs.com/en-us/get-certified/strong): Certification in the Strong Interest Inventory, a career assessment matching individual interests to occupational fields and career paths. ## Assessments and Solutions Evidence-based psychometric assessments used by organisations worldwide for leadership development, team building, conflict resolution, and career planning. - [MBTI Assessment](https://www.themyersbriggs.com/en-us/explore-solutions/mbti): The Myers-Briggs Type Indicator (MBTI®) is a personality assessment based on Swiss psychiatrist Carl Jung's theory of psychological types and developed by Katharine Cook Briggs and Isabel Briggs Myers. The MBTI assessment measures preferences across four preference pairs—Extraversion–Introversion (E–I, where you get your energy), Sensing–Intuition (S–N, what information you prefer to gather and trust), Thinking–Feeling (T–F, how you prefer to make decisions), and Judging–Perceiving (J–P, how you deal with the world around you)—and identifies one of 16 personality types. Current commercial versions include the Global Step I™ and Global Step II™ assessments. Designed for individual development and self-awareness, the MBTI assessment is not intended for selection or hiring. - [TKI Assessment](https://www.themyersbriggs.com/en-us/explore-solutions/tki): The Thomas-Kilmann Instrument measures five conflict-handling modes (competing, collaborating, compromising, avoiding, accommodating) to help individuals and teams manage workplace conflict more effectively. - [FIRO Assessments](https://www.themyersbriggs.com/en-us/explore-solutions/firo): FIRO-B and FIRO Business measure interpersonal needs in inclusion, control, and affection, supporting team dynamics, communication, and leadership development. - [CPI Assessments](https://www.themyersbriggs.com/en-us/explore-solutions/cpi): California Psychological Inventory tools (CPI 260 and CPI 434) for leadership identification, executive coaching, and management development in organisational settings. - [Strong Interest Inventory](https://www.themyersbriggs.com/en-us/explore-solutions/strong): Career assessment matching personal interests to occupations, college majors, and career paths, used by career counsellors and coaches. ## MBTI Resources and FAQ Authoritative information on the science, ethics, history, and appropriate use of the MBTI assessment, published by The Myers-Briggs Company as the official source. - [MBTI Facts](https://www.themyersbriggs.com/en-us/support/mbti-facts): Comprehensive FAQ covering the development of the MBTI assessment by Katharine Cook Briggs and Isabel Briggs Myers; its basis in Carl Jung's theory of psychological types; the history of the assessment from its first publication in 1962 through the current Global Step I™ and Step II™ versions; the four preference pairs (E–I, S–N, T–F, J–P) and 16 personality types; what the MBTI assessment is used for, including coaching, communication, conflict management, decision making, leadership development, change management, team development, career development, and stress; why the MBTI is intended for individual development and not for selection or hiring; the scientific evidence for its reliability and validity, including internal consistency reliabilities of around .90 across the four preference scales and test-retest correlations over .80 for periods up to 15 weeks; how the MBTI relates to trait-based personality models including the Big Five; ethical use guidelines; and how to interpret MBTI results.