Very preliminary systems concepts are presented for the Order and Standard Loan Subsystems. Each of the tasks defined for the current manual operations in (Library Systems Development) LSD 70-60 are evaluated against these concepts to determine how existing work will change when mechanized systems are installed. Then, utilizing this qualitative assessment, estimates are made of the percentages of the existing work which would be replaced by machine operations. Ranges of replaceability estimates are presented for both MAIN and SECONDARY operations. (Other documents on this program are: LI 003640 and 003641.) (Author)