Temporal Aspectsof Usability How MachineDelaysChangeUser Strategies PaddyO'Donnell& StephenW. Draper As machine responsedelays vary, the most important ef~ct on users may be not their annoyance but that they change the way they use an inter~ce. Even the very simple task of copytyping three digit numbers gives rise to at least three dif~rent user strategies (i. e. procedures). However the e~ct seems not be a simplefunction of delay length, contrary to earlier reported work. Instead users are probabt¢ shifting between strategies more fluidly. depended simply and directly on the magnitude of machine delay relative to an individual's typical reaction time. We set out to replicate and extend Teal & Rudnicky's findings, but encountered more mixed results suggesting that other issues also affect a user's choice of strategy. The Task Teal & Rudnicky's task is one of the simplest in which such flexibility of user "strategy" (i.e. the detailed method a user adopts for the task) can arise. The task is the routine data entry by copytyping of 3 digit numbers from a printed list..After entering a number (3 number key presses followed by ), there may be a delay as if the machine were processing it before the prompt appears
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How machine delays change user strategies
O'Donnell, Paddy; Draper, Stephen W.
Follow ACM SIGCHI Bulletin
, Volume 28 (2)
Association for Computing Machinery – Apr 1, 1996
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