Abstract: The approach presented by Wong and Beasley(W-B)to construct assurance regions(AR)for restricting DEA multipliers often results in the problem of no feasible solution The reason lies in that there exists logical inconsistency when the approach uses the concept of importance To solve the problem,this paper presents a modified W-B approach to construct AR restrictions The modified approach has three advantages over the W-B method,e g well overcoming the problem of logical inconsistency Applied to a real efficiency evaluation,the modified approach as well as the corresponding DEA/AR model proves to be feasible and reasonable.

Key words: DEA, weight importance, assurance regions, DEA/AR model, optimal statistical estimation