Existing tools measuring athletes’ psychological strategies have various practical limitations including (a) not capturing the perceived effectiveness of psychological strategies in pursuing desirable outcomes; (b) overlooking stages of competitive involvement, such as before training or the night before competition; (c) and being predominantly paper-based. In the present case study, the author explains the process of developing an alternative assessment tool called the Profile of Psychological Strategies (ProPS). This new profile aims to measure athletes’ perceptions of which strategies they use, to pursue which desirable outcomes, and how effectively. The ProPS has its theoretical roots in Fletcher and Sarkar’s approach to developing psychological resilience and was developed based on an adapted version of Radhakrishna’s Sequence for Instrument Development. This case study can be useful both for sport experts looking for a practical and flexible way to measure athletes’ psychological strategies and for those aiming to develop their own applied assessment tool.