Suppose that you have been hired to give your expert opinion of a direct manipulation interface designed to help network managers. The supported actions include determining which nodes are suffering from network delays, blocking transmission of packets from nodes which are out of control, and determining which nodes have been most recently rebooted.

a. List 5 items from a heuristic evaluation checklist that you would consider when evaluating this interface. b. What sorts of potential usability problems would a heuristic evaluation be unable to detect?