Abstract: A services-oriented system for knowledge assessment and learning performs a method of receiving a plurality of two-dimensional answers to a plurality of first multiple-choice questions, determining, after a period of time, which of the answered multiple choice questions remain unfinished and which are completed, separating the unfinished questions from the completed questions, determining which of the unfinished and completed questions to include in a mastery-eligible list of questions, assigning a weight to each of the mastery-eligible questions based on the current learning state of the learner, a target learning score of the learner, and a calculated dopamine level of the learner.