SUMMARY
The purpose of the study is to create an income statement-based and a balance sheet-based data envelopment analysis (DEA) model, and to demonstrate these models on Johannesburg Stock Exchange (JSE) listed firms and to compare the technical and scale efficiencies of firms among the two models. A convenience sample of 51 JSE-listed industrial companies over a three year period was selected. The practical value of this modeling exercise is that corporate managers can become conscious that, although the income statement and balance sheet performances tend to be related, there is evidence of a significant gap between firms performance according to these measurements.