Recent research into motivation and achievement behaviour in sport has focused on achievement goal theory. This theory states that two goal orientations manifest themselves in achievement contexts and impact on the motivation process. These two goals have been defined as 'task' and 'ego' goal orientations. This paper traces the development of the Perception of Success Questionnaire as a measure of achievement goals developed specifically for the sport context. The early development of the questionnaire is documented, in which the scale was shortened from the initial 29 to the current 12 question format. We demonstrate that task and ego goals are orthogonal, internal reliabilities for the orientations are high, with strong construct and concurrent validity. We conclude by reporting results from two recent confirmatory factor analyses that were conducted on the Children's and Adult versions of the questionnaire; these results show the Perception of Success Questionnaire to be a reliable and valid instrument to measure achievement goal orientations in sport.