Dr. William Marston invented the DiSC personality model in his 1928 book, The Emotions of Normal People. Several decades later, his work was followed by Dr. John Geier, who created a DiSC personality assessment as a tool for applying DiSC theory to everyday life. John Wiley & Sons (formerly Inscape) now owns the DiSC assessment, which they publish in several flavors, along with other DiSC-based training materials and reports.
But what is the DiSC personality assessment? It draws upon four behavioral dimensions: Dominance, influencing, Steadiness, and Conscientiousness. Many people have composite styles of two dimensions, a primary and a secondary, such as Di or SC (or iD or CS, which is a subtle but important distinction).
DiSC is a very popular program for corporate training, employee development, organization effectiveness, and other human resources or training and development applications. This is because DiSC offers a language for individuals to discuss their behavioral styles and differences. The DiSC personality assessment teaches people ways to modify their natural approach to build more constructive, effective workplace relationships.