1 / 16

IE 327 Introduction to Work Design Dr. Andris Freivalds Class #15

IE 327 Introduction to Work Design Dr. Andris Freivalds Class #15. Coding of Information & Visual Displays (pp. 306-316). Types of Information Quantitative – specific numbers: feet, psi Qualitative – general values: trends, up/down Status – small set of conditions: on/off/standby

pearl
Download Presentation

IE 327 Introduction to Work Design Dr. Andris Freivalds Class #15

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. IE 327 Introduction to Work Design Dr. Andris Freivalds Class #15 IE 327

  2. Coding of Information & Visual Displays (pp. 306-316) • Types of Information • Quantitative – specific numbers: feet, psi • Qualitative – general values: trends, up/down • Status – small set of conditions: on/off/standby • Warnings – emergency: alarms • Alphanumeric – text: signs • Representational – symbols, colors as codes • Time-phased – blinking lights IE 327

  3. Display Modality (5 senses) IE 327

  4. Display Dimension • Select appropriate dimension • Brightness, color, rate, size, • Absolute vs. relative judgment • Relative = direct comparison (300,000 colors) • Absolute = no direct comparison, limited • Miller’s rule = 7+2 levels IE 327

  5. Which is Larger: A or B? IE 327

  6. Discriminability of Codes • Just noticeable difference = minimum difference between two stimuli so as to be distinguished • Weber’s Law: JND = k S IE 327

  7. Compatibility • Relationship of stimuli and response consistent with human expectations: ↓ RT, ↓ errors • Basic principles: • Affordance: perceived = actual property • Mapping: spatial compatibility • Direct drive • CW ↑settings • Scale readings ↑ L to R • Feedback: keyboard click IE 327

  8. Redundancy • Present same information on two or more • Dimensions: color and intensity • Channels: auditory and visual • Decreases errors and RT • But limits potential information IE 327

  9. Design Principles for Visual Displays-1 • Digital vs. Analog? • Precision vs. approximation • Exact value vs. trend • Watches??? IE 327

  10. Design Principles for Visual Displays-2 Fixed scale, moving pointer: best Moving scale, fixed pointer: not good IE 327

  11. Design Principles for Visual Displays-3 Basic features of dial: • Scale: • Major/minor tics • Progression • 10’s, 5’s best • 2’s OK • 3’s never • Pointer • Pointed • Meets smallest tic • Avoid parallax IE 327

  12. Parallax IE 327

  13. Design Principles for Visual Displays-4 Panel (bank of dials) design: • Use patterns • Make deviant dial conspicious • Extended lines/pointers IE 327

  14. Design Principles for Visual Displays-5 • Minimize informational load (Miller’s Rule) • Indicator lights • Flashing creates arousal/attention • But flicker fusion rate (Movies 24/sec) • Labels • Proper size: at 20 in. → 10 pt = 22 arc min, but 1:6 strokewidth/height ratio • B on W for day, W on B for night (irradiation) • Mix upper and lower case • Warnings: bold and upper case IE 327

  15. Design Principles for Controls - 1 Control-response ratio= amount of control move amount of response move • Low C/R = high gain • coarse control • High C/R = low gain • fine control • Optimum C/R = best response time • ↓ travel time • ↓ adjust time IE 327

  16. Design Principles for Controls - 2 • Horizontal displays: Warrick’s principle = closest points on display & control move in same direction • Stick controls: up = increase, forward = increase?? • Different planes: CW = ↑, right-hand rule IE 327

More Related