 attend us scienc librari m t thi interim report continu studi librari oper massachusett institut technolog member institut's oper research project cooper librarian librari staff in report base actual observ on-the-premis scienc librari statist measur kind degre intens tabul in addit suggest measur effect librari a uniqu outcom survei construct verif mathemat model emploi probabl theori measur rate kind librari materi length stai librari patron such model characterist oper approach promis further goal effect librari manag plan 