1. Bay Area Rapid Transit Sign System Analysis Presenter: Eric Rozell

2. Sign System Image from http://www.bart.gov

3. Types of Signs SignType Bold-face wordsindex Non-emphasized wordsIndex Colored linesindex, symbol White circlessymbol Perpendicular line markersindex “Dashed” colored linesindex Airplane iconicon

4. Library, Cognitive, and Social Science Principles Realizes that not all travelers are “experts” – System navigable using only simple geography and pattern matching Organization of information by geography – Imagine a table of routes and stops… Signs by convention – Using colors for routes – White circles for transfer stations

5. Is this an “expert” system?

6. This is bad. Image from http://www.wmata.com

7. Syntax, Semantics, and Pragmatics Pragmatics - Context! – Map provides geographic reference, stations provide remaining context Semantics – Do rails run actually side-by-side? – No.

8. Information Model

9. Questions?