The Distributed Operation Dansform(dOPT), pr~ posed by Efi and Gibbs, is used to dfie concurrently updatable shared objects. Eh and Gibbs give the OP eration tr~ orrus that d&e a simple shared text editor supporting single chmacter insertions and deletions on a hear btim. We report here on the construction of operation transforms for a more sophisticated group nwe appficatiou a shared spreadsheet. We identify a set of abstract operations that &aracterize the operations on a spreadsheet. Using Cormack’s Cdtius for Concurrent Update, which extends and corrects dOPT, m’egive the tr~ forms on these operations necessary to d~ e a shared spreadsheet.~ re use the transforms to btid a shared version of SC, the Unix spreadsheet due to Goshg.