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HCI – Evaluating and Measuring Success

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?

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HCI – Evaluating and Measuring Success

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  1. HCI – Evaluating and Measuring Success

  2. 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?

  3. Using Schneidermans 8 golden rules Check 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

  4. Ask the user’s opinion • Use 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 more • important to use specific, clear, comprehensive and unambiguous questions, quantified where possible • e.g., daily?, weekly?, monthly? Rather than “seldom”, “often” and there should always be a “never” • Allow an area for feedback – i.e. Comments area • Use feedback and questionnaires to revisit/ improve system

  5. Speed • How 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 2011 • Target 1 minute • Will accept 1.5 mintues • Will revisit system if it takes more than 1.5 minutes.

  6. Keystrokes • How 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 stadium • Target 5 touches/clicks • Will accept 7 touches/clicks • Will revisit system if it takes more than 7 touches/clicks.

  7. Errors made • How 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 stadium • Target 0 errors – info found first time • Will accept 1 • Will revisit system if it takes 2 or more incorrect choices of button/icon.

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