Many current ICT-supported reform efforts demand teachers to assume the role of epistemic facilitator of knowledge construction supported by technology. It is thus important for teacher educators to understand teachers’ epistemic beliefs. This qualitative study investigated seven Singaporean in-service teachers’ epistemic beliefs and their pedagogical beliefs. Two interviews were conducted for ...

Floating-point numbers and floating-point arithmetic contain some surprising pitfalls. In particular, the widely-adopted IEEE 754 standard contains a number that is “not a number,” and thus has some surprising properties. One has to be extremely careful in writing assertions about floating point numbers, to avoid these pitfalls. This column describes the problems and how a language might elimin...