learning is a strategy which requires a learner to compare and contrast groups or categories that contain concept-relevant features with groups or categories that do not contain concept-relevant features.

The concept of concept attainment requires the following five categories:
#the definition of task;
#the nature of the examples encountered;
#the nature of validation procedures;
#the consequences of specific categorizations; and
#the nature of imposed restrictions.In a concept learning task, a human classifies