In 1920, 66 years ago, in Geneva, on Claparede's initiative, 16 psychologists coming from 7 countries met to discuss “Nature and Nurture in Aptitude Development”. They had a fruitful meeting, decided to create IAAP, and immediately started to organise the second Congress of Applied Psychology which took place in Barcelona in 1921. IAAP is, therefore, the oldest international association of psychologists. Thirty‐five years later, and after a period of inactivity due to the war, there was a big step forward. Five hundred psychologists from 29 countries met in London for the 12th IAAP Congress, and Dr. Frisby, opening the Congress, could already take pride in the diversification of our field, quoting educational, clinical and social i