The state of Connecticut has introduced a fourth-grade mastery test that assesses thinking skills. The test was developed cooperatively by the state's Department of Education, a testing corporation, and several cognitive psychologists; several alternative models of thinking were synthesized to produce a theoretical foundation for the test. (MCG)

Reports results of procedures directed at isolating and identifying students' difficulties in comprehending the concepts involved in lessons about gas exchange and respiration. Indicates that pupils (n=137) had deficient understanding of prerequisite concepts and tended to operate at the concrete operational level, whereas the highly abstract…