Muscular strength tests are of fundamental importance for the physiotherapeutic diagnosis and a difficult issue for learning. Also, there are very few softwares specifically developed for teaching/learning and diagnosis in the Physical Therapy area. This work describes the development and evaluation of MuStreT, an educational multimedia computer tool for Physical Therapy students. MuStreT integrates hypertext, movie clips, narrations, animations, self-evaluation questionnaires, and was inspired by the constructivism concepts. The software was developed using Unified Modeling Language concepts and implemented using animation and authoring tools. MuStreT was quantitatively evaluated by Physical Therapy students and qualitatively evaluated by Physical Therapy professionals/lecturers and Computer Science students. Results show that learning was increased using MuStreT, thanks to its interactivity potential and multimedia features. This work suggests that the use of informatics in Physical Therapy education has a great potential for improving the teaching-learning process.