Abstract: A document can be collaboratively edited by multiple editors by providing each editor with a separate copy of the document. Each editor then edits his own document copy using an editing application program, such as a word processor, to produce an edited copy. The edited copies are then retrieved and compared and a single marked-up document is created in which sections (for example, paragraphs) of the original document and corresponding sections of each of the edited documents (with changes from the original document indicated) are displayed in physically adjacent locations of the display screen. The displayed sections contain both edited and duplicated, unedited text. A set of "consolidation" tools are provided to quickly transfer edits between the physically adjacent areas of the screen and to make, or accept, edits made by any of the editors. A final document copy is made by eliminating the duplicate text in the sections.