Abstract
A year-long teac.hing exp~riment explored ihe possibility of changing fourth grader'sapproaches to mathematical problem solving. A metacognitive question-and-answer technique was used to negotiate meaning, explore problem representation, discuss possible solution strategies" and reflect on the, problemsolving, enterprise. Analysis of the transcript data, classroom observations and childrens' work samples revealed that while those with most io g(lin and notJiing to lose demonstrated the greatest shift in approach, each child's approach was successfully challenged to some extent.