Pg. 67 Programmed Instruction
Third paragraph describes how sometimes failure is a good thing because it makes the learner work harder at a difficult task, this then provides information as to what the learner can and cannot do. I guess this information could then be used in the analysis of whether a student has mastered an objective or if remedial work should be given to the learner. I wonder though, if not being able to successfully complete a task would frustrate a student that is used to constant success?