This conceptual framework is grounded in the data analysis of transcribed interviews with 50 Ontario teachers and the text of a 7-month online discussion group among 25 principals from England, Ireland, Canada, United States, Australia, and New Zealand. Both methods were employed with the stated purpose of understanding emotional experiences of…

Investigated was how easily pupils aged 12 and 13 who were initially unaware of the invariance of an operation (with decimals) modeling a situation could be led to such awareness. Results from clinical interviews are reviewed and a protocol presented. It appeared difficult to induce conservation. (MNS)