Fundamentally, a graph is a simple concept. At a basic level a graph is a set of relationships {e(n0;n2);e(n0;nj);:::;e(nj-1;nj)} between elements. This simple concept, however, has afforded the development of a complex theory of graphs [1] and rich algorithms for combinatorics [7] and clustering [4]. This has, in turn, made graphs a fundamental part of educational data mining.
