The Extended DISC® system is based on a psychological theory developed in the 1920′s. Carl G. Jung created the foundations for the theory in his book “The Psychological Types”. His ideas were based on defining four behavioural axes: Sensation-Intuition, Introversion- Extroversion, Perceiving-Judging and Thinking – Feeling, often referred to as Behavioural Continuums.

The work of Jung was further developed by William Moulton-Marston who identifyied predictable actions and personality traits within human behavior and narrowed them into four DISC types: Dominance; Influence (originally – inducement); Steadiness (originally – submission) and Compliance. The DISC profile identifies 160 different behavioural styles.


The Extended DISC® was founded in 1994 by Jukka Sappinen, an MBA from the Helsinki School of Economics who spent his early professional years consulting clients in the use of psychological tools. A profound understanding of the gap between existing tools and corporate needs enabled Jukka to develop what his clients were looking for: an instrument that combines a range of valuable analyses, forming a simple, unified system that can be used to generate understandable, integrated information on an individual, team, or entire organization.

Currently the company is one of the top three companies in the field today and is spread to over 50 countries. Questionnaires has been translated into 55 languages. The company has always been a technology leader in the industry. It was the first one to introduce Windows based software system. Similarly, it was the first to introduce an online solution to enable completion of the questionnaires online in 1999.

Validation of the Extended DISC Assessments

Extended DISC® is a suite of scientifically validated, online assessments used by thousands of organizations world wide. Extended DISC International publishes a validation study every 2 years. It shows a remarkable consistency in results.

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