DISC History

• The original DISC model was developed by Dr. William Moulton Marston in the 1920s. In his book: Emotions of Normal People, he published his study on human behavior and conceived the original DISC model as a way to categorize different personalities styles based on his research.
   
• Over the years since, researchers have interpreted and advanced Dr. Marston's original model into modern-day psychometric analysis and measurement. Early measurement of DISC concepts started in the 1950s and by the early 1970s, the first DISC assessment, called the Personal Profile System^® (PPS) was produced by John Geier. He formed a company called Performax. Later that company became Inscape Publishing and is now known as Wiley's Workplace Learning Solutions Group.
   
• In 1994, the new PPS 2800 assessment (28 items) was created and was renamed DiSC^® Classic. Its results are reflected in graphical format. It is still used today.
   
• In the early 2000s, the Everything DiSC^® series, represented by a dot on a circumplex, was launched by Inscape Publishing. It contained 79 assessment items.
   
• From the years 2007-2019, the Everything DiSC^® Sales Profile, Management Profile, Workplace Profile, Work of Leaders Profile, Productive Conflict and Agile EQ Profile were launched.
   
• The Everything DiSC^® on Catalyst Platform was launched in 2020.