This thesis postulates the theory that software usability evaluation should be adapted to the culture in which it is carried out. An experiment has been conducted to explore the effectiveness of usability assessment tools (UATs). These UATs are studied in the context of usability evaluation phase of the global software development life-cycle. In particular, the study investigates whether imported UATs were appropriate in the usability evaluation of a localised spreadsheet in Malaysia. The experiment reveals that there is some support for the thesis and recommends a further large-scale formal study.