Kelley's (\ 955) repertory grid is an innovative psychological test designed to reveal the way in which a person uses concepts to view important individuals in his life. Although there are many ditlerent forms and methods of administering the grid (see Bannister & Mail'. 19(8). the basic technique is simple. The individual being ~ested is given a form with a set of role categories across the top and IS asked to till in the names of specitic people for each role. The examiner then picks successive sets of three individ uals and asks the subject how, in some important way. two of the individuals are alike and different from the third. In answering, the subject has generated a conceptual dimension (a "bipolar construct" in Kelly's terminology) and can then rate at which end of the dimension the other individuals fall. Each time this is done. a row of the form is tilled in. Thus. at the end of the test. one has a binary matrix. The completed grid is rich in information. and a variety of methods have been devised for analyzing it. Natural questions one might ask are: which conceptual dimensions are used analogously and which individuals are viewed as being similar. A method to answer these questions. based on a graph-theoretical analysis of the grid data. has been formulated and a computer program to perform the analysis has been implemented. It is necessary to introduce a few concepts from graph theory before describing the method and associated program. Graph·theoretical formulation. A graph. G = (V, E). consists of a tinite nonempty set. V, of "points" and a set. E. of pairs of points termed "edges." Given the data from a completed grid. two types of graphs can be formed. The tirst type is a persoll-graph. in which each individual is associated with a point of the graph and there is an edge between a pair of points just in case the pairs of individuals are viewed to be suitably similar. The second type of graph is a cOllstmet-graph. in which each construct is associated with a point of the graph and there is an edge between a pair of points just in