As the name suggests, two individuals were responsible for coming up with the Myers-Briggs personality test and its indicator system. Katherine Cooks-Brigg, a researcher into personality, and her daughter and co-researcher, Isabel Briggs Myers, came up with the idea, basing it largely on the theories of Jung as laid out in his book, 'Psychological Types'. Initially, the idea was to come up with a systemic way of identifying personality types among women entering the labour force during the war. Still, it was soon extended well beyond that original remit.