Numerical precision is the very soul of science . The current practice of most usability measurement is not numerically precise. This does not mean that usability, or at least certain activities that fall under the broad topic of usability, are not science and cannot be precise. It means that there is still much honing to be done. Practitioners address the usability of everything from simple Web sites to mission-critical health care devices. Qualitative inspections may be sufficient for the former but are risky for the latter . In general, when the consequence of an unusable event (e.g., unintended actions…
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