A key feature of ArgoUML are the critics, which run in parallel with the main ArgoUML tool. When they find a problem, they typically raise a to-do item, and also highlight the problem on the editing pane. The graphical techniques used for highlighting are called Clarifiers
Note icon (). Displayed at the top
left of an artifact indicates a critic of that artifact. Moving the
mouse over the icon will pop up the critic headline.
Colored wavy line (). Used for critics
specific to sub-components of graphical artifacts. For example to
underline attributes with a problem within a class.
Solid colored line (). Not seen in ordinary
editing, but used when a to-do item is highlighted from the to-do pane
(see Chapter 13, The To-Do Pane) by button 1 double click. The
solid line is used to show all the artifacts affected by the critic,
for example all stimuli that are out of order.