Here's some useful things to consider which I picked up from looking at Rubin & Chismell's Handbook Of Usability Testing and Usability Engineering by Jakob Nielsen:
- Make test users feel as comfortable as possible.
- Make clear to users it is the system being measured, not them.
- Make clear to users no information will be revealed - Everything is confidential.
- All test users should remain anonymous.
- Inform them they can stop the test at any time.
- Minimise the number of observers.
- Ensure you've answered all their questions before you start the test.
How to achieve this:
- Environment should be comfortable/quiet
- Serve refreshments
- Make sure everything is ready before hand i.e. computer, hand-outs, recording devices...
- Turn mobile phones off
- Make the first task relatively easy
- Make sure there are no disturbances
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