Classificatory behavior of 41 fourth graders enrolled in a science program at the National Zoological Park in Washington, D.C. was assessed on an instrument adapted from Piaget's interviews with children on class inclusion. Developmental levels were related to student performance in the program. Data analysis shows that students with a high…

In the elementary and secondary schools, there is a movement toward a sequential instructional program which would involve the offering of a laboratory science each year from kindergarten to high school graduation. In some schools teachers have turned to science kits as a partial solution to the problems presented by restricted space, inadequate…