Developmental assessment: 18 months to 4 1/2 years. The Bus Puzzle Test.

The Bus Puzzle Test for assessing developing language and some performance skills has been standardized on a sample of 425 children living in an inner city area and a rural market town. The age range was 18 months to 4 1/2 years. The study provides levels of achievement in comprehension by age and shows the importance of the 27-33 months period in the development of situational understanding. Assessment of expressive language takes account of the strategies employed by young children to express meaning. The early stages of form perception are examined. Results are provided in graphic and tabular forms and provide a data base for converting an individual child's scores into variation from average.