The core of the ideas behind DISC date back as far as the ancient Greeks. It was Hippocrates, originator of the
famous Hippocratic Oath, who first considered human behaviour in terms of four separate factors.
His ideas, based on the four Greek elements of Fire, Air, Water and Earth, were still being used by physicians more than a
thousand years after their inventors death.
Of course, the modern DISC technique has a more scientific basis than the four elements used by Hippocrates.
Nonetheless, his basic principles are still valid today, and terms invented by him and his school,
such as melancholic and phlegmatic, are still in common use.