The study, begun in 1974 across the UK, used a battery of tests, including IQ, personality, behaviour and in-depth interviewing for children, parents and teachers. The group of labelled gifted were found to have significantly more emotional problems than the non-labelled group, which they mostly grew out of. Now in their forties, a gifted childhood has not always delivered outstanding adult success. Better predictive factors were hard work, emotional support and a positive, open personal outlook.