Generally, when a person has to start a learning of a given activity from a scratch, his early progress will be slow. E.g., an infant’s progress in learning to walk is very negligible in the beginning. (b) Period of rapid progress In this stage, the learner’s output raises rapidly. e.g. In typing once the learner has developed coordination of the movement of fingers he shows rapid progress. (c) Period of no apparent progress Learning curves frequently display a period of no apparent progress. It is also known as plateau. A period of no visible learning progress, preceded and followed by improvement is called as plateaus. E.g. In typing, a person may after having made rather consistent progress for sometime, reach a point where perhaps for weeks no further progress is made.