Investigated: (1) adaptability of the Binet tests to American conditions (2) changes in serial arrangement necessary for reliability (3) other tests that could supplement the Binet series, and (4) psychological and pedagogical value of the tests individually and collectively. The study was conducted on 396 non-selected children (kindergarten to the 8th grade; aged 4 yrs to 15 yrs), in distraction-free hallways and vacant rooms of various school buildings. The time required for the tests was between 30 and 45 mins, depending upon age, the number of tests covered, and the promptness of responses. The results were inconclusive for the 13th to 15th yr children due to small number of cases in these ages. The scale seemed to be far too easy at the lower end, and too difficult at the upper end. For California children, some of the tests will have to be moved by 3 yrs, as indicated by the results.