Abstract

While everyone knows the Repertory Grid made its debut in the first
volume of Kelly's 1955 twovolume The Psychology of Personal Constructs
(Kelly, 1955/1991), it is probably not so well known that Kelly also presented
a method of a naly sis of grid data in that volume. He referred to it as a form of
C(factor analysis," and termed it a (Cnonparametric solution to the problem"
which "gives essentially the same answer that conventional factorial methods
give and in such a small fraction of the time that the method is quite
feasible for clinical use." This method was subsequently programmed for a
computer as early as 1962 but a published version did not emerge until 1986
in the UK (Potter and Coshall, 1986). However, the earliest application of
factor analysis was that of Levy and Dugan (1956). They also introduced the
notion of using ratings to locate elements on constructs (and thus simplity
the calculation of correlations for factor analysis) and showed rotated factor
loadings for constructs. At the same time a tradition of using indices to
summarize grids was started with Bieri's cognitive complexitysimplicity
index (Bieri, 1955). The summary index tradition has continued in North
America to this day, while the representation tradition has developed in the
UK and Europe. In this chapter, we review traditional summary indices
and describe recent developments in measuring the concepts of conflict and
cognitive complexity. We also review ways traditional and new approaches
to representing grid data.