Tool – An open source web tool for repertory grids rep:grid – repertory grid software, 3D Grid Analysis WebGrid 5 nextexpertizer – computer supported repertory grid interview and analysis tool Idiogrid – Idiographic Analysis with Repertory Grids Gridsuite – Repertory Grid Software Culturetools – Repertory Grid for Organizational Development and Brands Constructivism (psychological school) Factor analysis Knowledge representation Psychological testing