Describes a simple 16-item instrument, the Propositional Logic Test (PLT), that is based on Piagetian theory and a study that explored the use of the PLT in diagnosing student misunderstandings. Analysis of individual student responses revealed a number of systematic errors in interpreting the logical operations in the PLT items. (Contains 23…

This paper suggests that knowledge of the school mathematics curriculum, as one of the key components of teachers' education, can be extended to include concepts and structures that generally belong to hidden domains of the curriculum. Motivated by work done with elementary pre-service teachers in a mathematics course employing a hidden…