ABSTRACT
The meaning of ‘ development The term ‘ development ’ covers various processes. It may indicate something regarded as merely quantitative, such as the simple increase in vigour of an activity ; or it may be used to designate the increase in stability and regularity of a function which has already appeared, as, for example, when the attempt to say a certain word is at first very insecure or at least only succeeds once in half a dozen times, but finally becomes perfectly regular ; or it may be used to cover new co-ordinations or combinations of processes, which previously worked only independently; or again, it may mean the appearance of new elementary or even of new complex functions which never before occurred, as, for example, when a child for the first time imitates a sound made by its mother.
