Wanting to classify human behaviour is not new. As early as 400 BC, it was the founder of Western medicine, Hippocrates of Kos, who set out to observe and explain human behaviour. He identified 4 temperaments:
- Choleric: quick temper, hot-tempered
- Sanguine: fiery and energetic
- Phlegmatic: calm and quiet
- Melancholic: heavy-hearted
Dr. Carl Gustav Jung
In a more recent time period (1875-1961), it was Dr Carl Gustav Jung who observed human behaviour from the 4 psychological functions: thinking, feeling, perceiving and intuition. He later added the two-part introvert-extravert.
Introverts focus their energy on their inner world.
Extraverted people focus their energy mainly on the outside world.
Jung published the work “Psychological Types”. This is still available.
Dr William Moulton Marston
Ultimately, it was not Jung, but American psychologist Dr William Moulton Marston (1893-1947), who in the late 1920s was the founder of what DISC is today. Marston published the work called “The emotions of normal people”.
Marston observed people’s behaviour from the following axes:
- The axis hostile (antagonistic) environment/good environment
- The axis passive responding/active responding