Evidence for the construct validity of Washington University's Sentence Completion Test of Ego Development is reviewed. The test has adequate validity for research purposes but is neither valid nor reliable enough to be used as a clinical instrument without further confirming data. (BH)

This combined text and manual presents the basic educational viewpoint of the Gesell Institute, that children should be entered in school (and consequently grouped and promoted) on the basis of their developmental or behavioral age, not on the basis of their chronological age or IQ. The introduction describes the research in which the Institute…