2.1-15 Indicating Completion of Processing

When processing in response to an entry is lengthy, the user should be given some positive indication of subsequent completion.

Additional Information:
Completion of the action commanded by the menu item will be sufficient feedback, provided that the action has a result that is visible to the user. However, if the completion of the menu item has no visible result, the additional feedback that the command was completed should be communicated by a message. If a user is currently involved in some new transaction, then completion of processing for a prior transaction should be indicated by nondisruptive display of an appropriate advisory message. If the outcome of a completed transaction implies the need for further user action, that should be indicated to the user.