Usability evaluators must broaden their methods and be open to nonempirical
methods, such as user sketches, consideration of design
alternatives, and ethnographic studies.
• Recommendations needs to be based on observational findings
• The design team needs to be involved with research on the current
system design drawbacks
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• Tools and techniques are evolving
• The range of evaluation plans might be anywhere from an ambitious
two-year test with multiple phases for a new national air-traffic–
control system to a three-day test with six users for a small internal
web site
• The range of costs might be from 20% of a project down to 5%.
• Usability testing has become an established and accepted part of the
design process