Assesses the physics, chemistry and biology content of the Nuffield Combined Science Course used in British schools by experimental testing to children's understanding of the course. A model by which the pupils' achievement is mapped to an estimate of their maximum Piagetian level of thinking is presented. (HM)

Investigates the effects upon concept acquisition of giving second-grade children the verbal labels of science concepts with which they have had concrete experience in a classroom setting using the interaction and evidence of interaction concepts from the Science Curriculum Improvement Study (SCIS). (HM)