Collaboration comments can be made at three different levels: model, diagram and element, so that team members can comment on the context in each level.
•Model comments: comments posted within the Model apply to all the diagrams, i.e. are visible from any diagram. These comments are found in the Diagrams tab.
•Diagram comments: comments posted within a diagram only apply to that diagram.
•Element comments: comments posted within a selected diagram element only apply to that element within a diagram.