The heuristics as published in Nielsen's book Usability Engineering are as follows: Visibility of system status: The system should always keep users informed about what is going on, through appropriate feedback within reasonable time.
Nielseni raamatus Usability Engineering avaldatud heuristikud on järgmised: Süsteemi seisundi nähtavus: Süsteem peab alati informeerima kasutajaid sellest, mis on teoksil läbi sobiva tagasiside mõistliku aja jooksul.