Inscriptio is an online reservation system with functionality similar to selecting an airplane seat. It allows eligible library patrons to apply for a preferred study carrel or hold shelf based on a map of locations with related data, such as nearby call numbers, and provides more efficient reservation management than the previous paper-based system. Inscriptio facilitates communication between patrons who share a carrel (some carrels at Harvard may be assigned to up to four users) and eases the renewal process when a reservation nears its end date.