When planning a library facility and estimating user seating space, the librarian must consider how many seats to provide and how much space is needed for each seat. In considering the number of seats, one must take into account the population served, collection size, and the kind of use made of the library. For example, at the State University of New York (SUNY)/Buffalo the allotted 6.25 square feet for each full-time equivalent student provides one seat for every four enrolled students, a workable ratio. The amount of space needed per seat depends on the kind of seating and the arrangement. At SUNY/Buffalo a table seat requires 20 square feet, an open carrel 25, and a lounge seat 30. Closed carrels and closed work spaces require larger spaces. (LS)