Analyzes videotapes of 42 children of 4-5 years and 24 children of 7-8 years playing doctors and nurses. Children were aware of the serial order of activities that occur in medical examinations. (RJC)

Through seriation, verbal seriation, and conservation tasks, investigated blind, partially sighted, and sighted children's understanding of quantity. Subjects were 81 children equally dispersed through these 3 groups. Age range was 4 to 17 years. Found similarity in concept acquisition among three groups that extended beyond quantity conservation…