Effectively targeting a heterogeneous student population is a common challenge in academic courses. Most traditional learning material targets the "average student," and is suboptimal for students who lack certain prior knowledge, or students who have already attained some of the course objectives. Student-activating learning material supports effective training. Adaptive systems may help to support learning for a heterogeneous group of students. Development of adaptive learning material, however, is usually a complex task not easily done by the average lecturer. An adaptive tutoring system is therefore designed that requires little knowledge and skills from lecturers: Proteus. Proteus provides adaptive navigation on a micro scale based on a set of closed questions. The questions are used both to measure, as well as to stimulate student progress. Entering questions in Proteus requires little effort from lecturers. Proteus is tested and evaluated in a Bachelor of Science (BSc) course with 91 students and is received very well. (Contains 7 figures and 3 tables.)