ACSD Evaluation Methods. and Usability Labs
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1 ACSD Evaluation Methods and Usability Labs Department of Information Technology Uppsala University
2 Why Evaluation? Finding out problems Checking for quality of task support Changing design 2/24/11 #2
3 Three main types of methods Testing methods Representative users work on typical tasks using the system (or prototype) evaluators check the outcome: How supportive is the interface? Usability problems? Other problems? 2/24/11 #3
4 Three main types of methods Inspection methods Usability experts (sometimes other categories) examine the application for usability problems 2/24/11 #4
5 Three main types of methods Methods based on inquiries Usability evaluators interview the users for: likes, dislikes, needs, understanding of system. Also observation studies (of real work) 2/24/11 #5
6 Usability testing methods Teaching Method Thinking Aloud Protocol Coaching Method Co-discovery Learning Performance Measurement Question-asking Protocol Remote Testing Retrospective Testing Shadowing Method 2/24/11 #6
7 Usability Inspection Methods Cognitive Walkthroughs Feature Inspection Heuristic Evaluation Pluralistic Walkthrough Perspective-based Inspection 2/24/11 #7
8 Usability Inquiry Methods Field Observation Focus Groups Interviews Logging Actual Use Proactive Field Study Questionnaires 2/24/11 #8
9 Usability Study Process 1. Plan test (tasks, scope, etc.) 2. Prepare materials (user profiles, prototype, instructions, forms, etc.) 3. Prepare location 4. Run a Pilot Test Test the test 5. Recruit users based on your user profiles (advertise, select, schedule) 6. Conduct Test (briefing, user debriefing, questionnaires) 7. Analyze Results 8. Fix user interface and Retest 2/24/11 #9
10 Important parts of most tests Briefing, debriefing (why did we test?) Personal data (even for anonymous tests) Background data can be used for categorizing, statistics 2/24/11 #10
11 While conducting a usability test: 1. Don t praise the subject. 2. Don t prompt with Like/dislike. 3. Don t ask about Easy to use. 4. Don t ask about expectations. 5. Don t give instructions. 2/24/11 #11
12 Wizard of Oz-testing Controlled experiment Testing non-existent technology Subject believes it is real Surprisingly simple method. 2/24/11 #12
13 Wizard of Oz Made big displays through cheating The experiments cheats computer intelligence is replaced by human control Many uses for simulation of intelligent applications We can test concept without protoype 2/24/11 #13
14 Wizard of Oz studies Often performed in Usability labs Ghost operator is hidden behind one-way reflecting mirror TV-cameras and audio recordings Operator monitors and responds to user activities Observer observes 2/24/11 #14
15 Usability Laboratories Artificial setting for conducting usability studies Technically advanced environments Mostly used for observation studies Simulated or real applications 2/24/11 #15
16 Sample laboratory layout 2/24/11 #16
17 Test room 2/24/11 #17
18 Control room 2/24/11 #18
19 Controlled environments Advantages Good data recording facilities Large amounts of co-ordinated data Repeatable experiments Relatively easy to make variations in conditions 2/24/11 #19
20 Disadvantages Dependent on technology Expensive Artificial environment Unnatural conditions for the experiment Overkill? 2/24/11 #20
21 Working scene An alternative to Usability Lab A complete model of the work space (e.g., a bank office) is built for the testing purpose Real customers are enacting their tasks with real bank clerques Environment is a copy of the real implementation Good for testing secondary and tertiary users 2/24/11 #21
22 A bank office 2/24/11 #22
23 Supplies Working scenes contextual information realistic usage situations Real user problems Requires Massive effort Detail scenario planning Money 2/24/11 #23
24 Chit-chatting Warming up the user Joking (has to be from the heart, though) Pre-tests Informal interview 2/24/11 #24
25 Turing test If the computer succeeds in the Turing test, it will be considered intelligent! But what about a human that fails it? 2/24/11 #25
26 Purpose? It is important to ask the right questions! The wrong questions give bad answers. Have you stopped beating your dog? What is the proper answer here? Yes or No? 2/24/11 #26
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