\input zb-basic \input zb-ioport \iteman{io-port 00148016} \itemau{Quesada, Vicente; Taneja, Inder Jeet} \itemti{Order preserving property of unified $(r,s)$-information measures.} \itemso{Soochow J. Math. 18, No.4, 379-395 (1992).} \itemab This paper discusses three classical measures of information: Shannon's entropy, Kerridge's inaccuracy, and Kullback-Leibler's relative information. The authors first review existing definitions and results on 2-parameter generalizations of the above information measures. By using an approach of mean of order $t$ they are able to extend order preserving results on information measures to the 2-parameter generalizations. \itemrv{I.S.Moskowitz (Washington)} \itemcc{} \itemut{information measures; divergence measures; order preserving; mean of order $t$; Shannon's entropy; Kerridge's inaccuracy; Kullback-Leibler's relative information} \itemli{} \end