Overall equipment effectiveness (OEE) is a critical key performance indicator for all levels of management involved in manufacturing operations.OEE is an important cultural background for an engineering that will work in a manufacturing plant. This paper discusses a simulation model as a learning tool that helps the students to analyze how the efficiency losses overlapping and affecting production rate of a single machine. Indeed the software allows professor to characterize the production system assigning specific technical data relating to cycle times, batch processing, setup, major stops, quality defects. This opens the possibility to simulate specific system behavior that the student has to point out by the analysis of OEE. The student can also suggest improvements and have a new feedback by the educator in a continuous learning approach. As a result this paper concludes by a set of examples for OEE teaching.