Although editors make extensive use of the computer in their work. Most editors still mark changes on paper using traditional editing symbols. There are, however, compelling reasons for editors to begin marking copy on the computer. We consider online editing from the perspective both of editors and their employers. We then focus on one aspect of online editing: the mark-up models embodied in various editing tools. We demonstrate that the different mark-up models and their particular implementations have major implications for the editing process, including the quality of edited material and the worklife satisfaction of editors and writers. We conclude by recommending that the technical communication community exert its influence on software developers and corporate technology planners to encourage the development and adoption of online editing tools that will be congenial to editors.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>