A measure of dissimilarity between the structure of instructional material and the structure of the learner's understanding

The present paper investigates the construction of a navigation system that assists the learner in linking learning task so that the structure of the learner's understanding will conform to the structure of instructional material. As an initial step, a measure of the dissimilarity between two digraphs expressing the structure of instructional material and the structure of learner's understanding, respectively, is defined. Details concerning the navigation will be reported at a later date.