In the third case the learner may have at his disposal all the habits necessary to perform the act but because he docs not know the proper sequence or coordination of the several habits he is forced to resort to trial-and-error learning.

This is true in all cases of acquiring skill, whether of handwriting, skating, driving an automobile, using tools, or what not.

A simple example may be found in the mirror-drawing experiment.

Take the one movement of tracing a Kne that appears in the mirror to go away from the body, diagonally to the right.

And, to make the case still simpler, suppose that the learner knows that he must draw toward his body when the direction appears to be away from the body and that he must draw to the right when the direction appears to the right.