Mother and daughter, they developed the Myers-Briggs Type Indicator, which has helped millions of people discover if they are introverts or extroverts or thinkers or feelers.
What personality are you? How the Myers-Briggs test took over the world theguardian.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from theguardian.com Daily Mail and Mail on Sunday newspapers.