Abstract
This study investigated the relationship between senior secondary students' written responses and
the mathematical and cognitive processing used when solving a complex problem. Response
maps were used to categorise scripts by global strategy. These categories were stratified into
clusters displaying common elements of mathematical structure and. cognitive demand. The
maps revealed difficulties faced by students in applying known facts and formulae to complex
word proble'ms. The overwhelming reason for failure on the task was inability to construct a
satisfactory model of the problem. The majority of students were able to identify and record the
essential elements of the problem and to recall necessary formulae and procedural skills for a
satisfactory solution but they had difficulty establishing crucial links between the data in their
representation. This did not necessarily reduce the cognitive demand of the task the student
attempted to solve. Cognitive demand appeared to be more related to global strategy chosen.