The HSI should give the user feedback indicating the action that was selected and allow the action to be canceled before it is executed.
Additional Information:
The goal of this recommendation is to avoid unintended manipulation of plant equipment or unintended interface management actions. Feedback about the selected option is important because a broad range of actions may be accessed through a soft control device, including manipulation of various plant components and of the user interface. The close proximity and similarity of input options within the display area may result in users selecting the wrong ones. Users should be able to cancel or modify an action if they determine that its execution would be undesirable.