The paper proposes to use the environmental intensity change index (EICI) as a measure of environmental operational performance. After making an exposition of the advantages of EICI, this paper empirically examines the comparability of EICI and the evaluation based on it across different sectors by using the actual data collected from over 200 Japanese companies. The results confirm that EICI and the evaluation based on it are comparable across companies from different sectors; mdicating that EICI is a fair and re...