1. Ch10 Screen Layout Yonglei Tao School of Computing & Info Systems GVSU

2. Screen Layout Find out  What the user is doing  What information is required  In what order things are likely to be needed Design  Let the required interactions drive the layout

3. Remote Control for Car Door

4. A Problem in 2008 Election A voting machine with a touch screen Barack Obama John McCain

5. News Map http://newsmap.jp/

6. User Performance Eye movement  Top to bottom, left to right Action sequences  Touch, keyboard, and mouse Task sequences  Work flow for accomplishing user tasks And task frequencies

7. Layout Appropriateness A metric to assess if the spatial layout is in harmony with the user tasks Help layout design and redesign  Specify task sequences and their frequencies  Produce a layout to minimize visual scanning  Evaluate it by how well it matches the tasks  Take into consideration user expectations about the positions of fields

8. Layout Appropriateness Formula Cost = Σ task frequency * cost of task all tasks A task is a sequence of widget-level actions users perform Costs are based on the distance users must move the mouse or Fitts’s law

9. The Original Design

10. Two Versions of Redesign

11. Testing Results Task Completion Time User Preference Rating

12. Issues to Consider Grouping and structure Ordering Decoration Alignment Evaluation

13. Grouping and Structure Logical together → Physical together Billing details: Name Address: … Credit card no Delivery details: Name Address: … Delivery time Order details: Item Description Quantity Unit Price Cost size 10 screws (boxes) 7 3.71 25.97 …… … … …

14. Order of Groups and Elements Find out the user's natural order of doing their tasks Match it on screen Provide support for navigation

15. Decoration White space Borders  Reinforce groupings, not for single fields and command buttons Headings and captions Fonts, colors, and image

16. Space to Separate

17. Space to Structure

18. Space to Highlight

19. Aligning Screen Elements Minimize alignment points on a window  Easy eye and mouse movement Vertical orientation  A top-to-bottom flow through controls Horizontal orientation  Need to enhance distinctiveness Balance elements with multiple groups and multiple columns

20. Alignment Text Large numbers Alan Dix Janet Finlay Gregory Abowd Russell Beale Alan Dix Janet Finlay Gregory Abowd Russell Beale Dix, Alan Finlay, Janet Abowd, Gregory Beale, Russell

21. Multiple Column Lists Sherbert75 Toffee120 Chocolate35 Fruit gums27 Coconut dreams85

22. Multiple Column Lists (Cont.) Sherbert75 Toffee120 Chocolate35 Fruit gums27 Coconut dreams85

24. Eye Tracking Eye tracking is the process of measuring either the point of gaze or the motion of an eye relative to the head Eye tracking demo

25. Example - Eye Tracking Test Factors on form completion  Label placement  Formatting  Type of form content Test subjects  Novice and expert users

26. Eye Tracking – Gaze Plots Source: “Label Placement in Forms”, Matteo Penzo, at http://www.uxmatters.com

27. Gaze Plots (Cont.)

28. Time Spent on a Search Form Rookies on eBay Pros on Amazon

29. Design Guidelines Follow the natural flow of work Group related fields effectively Provide good default values whenever possible Gray out unavailable components Use meaningful labels Provide mnemonics and accelerator keys for navigating between visual components