ABSTRACT
The methods of studying young children are very various. One may experiment or use observation only, and for either the help of the cinema may be enlisted. Tests of intelligence or of special abilities or of emotional reactions to certain stimuli may be made on large groups of children of given ages. Single children, twins or groups may be observed over a period in reference to some particular type of behaviour, or of language or thought; and to studies of groups various statistical methods may be applied. Finally, by the biographical method the development of the whole child may be recorded from the earliest days.
