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HCI – Evaluating and Measuring Success. From the user’s eyes…. Are your assumptions about what task your design is supporting correct? i.e. The meaning of an icon/button or a label? Will users notice what actions are available? Will they see a menu option or a particular button? - PowerPoint PPT Presentation
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HCI – Evaluating and Measuring Success
From the user’s eyes…Are your assumptions about what task your
design is supporting correct? i.e. The meaning of an icon/button or a label?
Will users notice what actions are available? Will they see a menu option or a particular button?
When they see a particular button will they recognise that it is the one required for the task?
Will users understand the feedback that they get. i.e please wait while the system checks your details?
Using Schneidermans 8 golden rulesCheck your system offers, when necessary the following:
1. Consistency
2 Enables frequent users to use shortcuts.
3 Offers informative feedback. i.e. Your booking is complete/confirmation printing etc
4 Design dialog to yield closure. i.e. exit, home buttons
5 Offer simple error handling. i.e. error messages/help button /undo buttons
6 Permit easy reversal of actions. i.e. undo button/back button
7 Support internal locus of control - A feeling that the user is in charge NOT the system, ease of use
8 Reduce short-term memory load - Don’t make the user have to guess what to do next, ensure navigation clear i.e. drop down boxes, menu choices etc
Ask the user’s opinionUse Questionnaires
“open” (‘write what they want’ reply) or “closed” (answers “yes/no” or from a wider range of possible answers)Avoid using ‘open’ if asking a large amount of users i.e.
100 or moreimportant to use specific, clear, comprehensive
and unambiguous questions, quantified where possiblee.g., daily?, weekly?, monthly? Rather than “seldom”,
“often” and there should always be a “never”Allow an area for feedback – i.e. Comments areaUse feedback and questionnaires to revisit/
improve system
SpeedHow long do you want to allow for your task
–
For Example:I want the user to obtain the ticket price of
the ‘Lee Mack’ concert on the 29 May 2011Target 1 minuteWill accept 1.5 mintuesWill revisit system if it takes more than 1.5
minutes.
KeystrokesHow many touches of the screen or clicks of
the mouse do you want to allow for your task –
For Example:I want the user to obtain the location of the
‘Next’ store nearest to the stadiumTarget 5 touches/clicksWill accept 7 touches/clicksWill revisit system if it takes more than 7
touches/clicks.
Errors madeHow many errors (i.e. use of the back button
due to wrong choices of button/icon) do you want to allow for your task –
For Example:I want the user to obtain the telephone number
of the ‘Frankie and Benny’s near the stadiumTarget 0 errors – info found first timeWill accept 1 Will revisit system if it takes 2 or more
incorrect choices of button/icon.
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