Abstract
A two-part study of the difficulties experienced by senior secondary (Year 12) students in writing inequalities from graphical linear programming problem statements is reported. The fIrst part of the study identifies possible difficulties and the second part evaluates a teaching programme designed to alleviate these difficulties. The teaching programme, based around a set of specific heuristics, is successful in alleviating some of these difficulties. The "pronumeral-as-obj~ct" notion and certain misconceptions of "constraint" prove resistant to remediation.