Collaboration comments can be made at three different levels, model, diagram and element, so team members can comment on the context of each level.
•Model comments: Comments posted in the Model level apply to all the diagrams and folders and are visible from any diagram in the model. These comments are found in the Diagrams tab and appear regardless of the folder in which they were created.
•Diagram comments: Comments posted within a diagram only apply to that particular diagram.
•Element comments: Comments posted within a selected diagram element only apply to that element in the diagram.