15. A computer-implemented process comprising: processing user input to modify an electronic document, wherein the electronic document has associated comment data and activity data, wherein the comment data defines a collection of comments and comprises, for each comment, a reference to a location within the electronic document, data indicating a user that added the comment, and content of the comment, and wherein the activity data defines a collection of actions and comprises, for each action, data indicating a type of action, and data indicating a user associated with the action, presenting a graphical user interface including: a document pane configured to display a graphical representation of the electronic document, a graphical representation of comments, displayed in association with the document pane, based on the comment data associated with the electronic document, and a graphical representation of actions, displayed in associated with the document pane, based on the activity data associated with the electronic document; in response to an input associated with a displayed comment, marking the comment as resolved by setting the value associated with the comment to indicate the comment is resolved and by adding an action to the activity data associated with the electronic document to indicate the comment is resolved; and in response to an input associated with a displayed action related to a resolved comment, marking the comment as unresolved by setting the value associated with the resolved comment to indicate the comment is unresolved.
16. The computer-implemented process of claim 15 , wherein displaying comments comprises displaying a graphical representation of only unresolved comments.