A note on imposing strong complementary slackness conditions in DEA

► A new DEA model, DEA/SCSC, imposes strong complementary slackness conditions. ► Solving the DEA/SCSC model with well-reputed software on real data produced wrong results. ► Such results are due to ill-conditioned basic matrices based on two properties. ► The size of the basic matrices increases significantly compared with the BCC model. ► Primal and dual variables measured in different units are added in the solution procedure.