ABSTRACT
The potential achievement of an individual, or a group, raises difficult problems which cannot be dismissed merely by pointing out the nature of Intelligence A and B. Neither genetic potential (innate mental power) nor constitutional potential are any use to us for predicting likely achievement, since we cannot measure them. Nor is Intelligence B (as measured by C) any longer appropriate if we admit that it is itself a form of achievement and affected by much the same factors that affect educational or vocational achievements. Nevertheless teachers and parents will not be dissuaded from believing that Johnny is not ‘working up to capacity’, nor psychologists and others from claiming that the underprivileged classes or the peoples of underdeveloped nations could achieve much more under better conditions.
