ABSTRACT
The head mistresses, in outlining the experiment, had said that intelligence tests should be used. There were two kinds of tests available—'individual tests', which are applied to one person at a time, and 'group tests', in which a number of people can all perform the test together. Here there were two purposes for which a test score was needed: first, for providing information about the capacities of those individual children selected for study: second, as a means of comparing groups, forms or divisions. Studies of the behaviour of a whole form during lesson-time were made by means of a special technique for recording observations. Before attending the lesson the experimenter was given a plan of the desks and the girls' names. The permission of the mistress was always asked before attending a lesson, and the experimenter sat as unobtrusively as possible in a corner, half facing the class.
