In the Learning Mode feedback is integrated into a sophisticated system of guidance for the student. Some errors prompt ALEKS to give specific hints and suggestions (Fig. 5.5). For example, it may say that a fractional answer needs to be reduced or that a list of expressions is incomplete. After a right answer the system will ask a limited number of questions for the same concept before judging that it has been mastered. If an item is missed too many times, however, a new topic will be suggested. If a concept has been left without mastery being attained, however, the system may suggest returning to it after one or two other topics have been covered.