A library building program is a reference handbook for the architects to use throughout their planning. It should contain--(1) table of contents, (2) index, (3) summary lists of space requirements, and (4) other useful summaries. The purpose of the program is to define the library building for the architect as interacting separate units of the library operation. If the program states clearly and intelligently what units must be included in the library, how large each one should be, and what will go on in each, and why, the basic planning of the building has been substantially completed. The specification of the library areas is the most important part of the library program. It should list the units to be provided in the library building, grouped to encourage the architect to think of those within each group as related to each other. Three statistics underlie the writing of specifications of the library areas--(1) the total number of student seats to be provided, (2) the total staff to be accommodated, and (3) the total number of loads to be shelved in the new building, at peak capacity for the period of time it is intended to serve. (RK)