Analysis of forgetting in a learning environment

Analysis of forgetting in competence-driven learning environment is presented. The main goal of this is to evaluate decreasing of abilities in time and estimation of assigning difficulty levels to tasks. The analysis in the paper is based on about 0.5 million records and conclusions are given which may help to improve both forgetting models, further creation of relevant tasks, and assigning difficulty levels to tasks. The records have been collected from real learning process as outcomes from task solutions during two years and several different courses and their modifications..