2.Usabilità
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Corso di Interazione Uomo Macchina del Prof.R.Polillo - Università di Milano Bicocca - DISCO - AA. 2009-2010 - Lezione 2 (vedi anche www.rpolillo.it)
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2.Usabilità
- 1. USABILITÀ Corso di Interazione Uomo Macchina AA 2009-2010 Roberto Polillo Università di Milano Bicocca Dipartimento di Informatica, Sistemistica e Comunicazione
- 4. Gli ostacoli all’usabilità: il modello di Norman
- 5. Un modello dell’interazione: il ciclo di feedback
- 6. Il modello di Norman
- 7. Edizione italiana: Donald Norman, “ La caffettiera del masochista” Editore: Giunti VIVAMENTE CONSIGLIATO Donald A.Norman
- 8. Esempio Alzare lo schermo
- 11. a)- b)-
- 12. Quale pomello accende la luce e quale il ventilatore? FAN LIGHT
- 13. Progettare la usabilità: affordance e feedback
- 20. Buona affordance
- 23. Affordance ambigua: suggerisce possibili usi alternativi
- 24. Esempio
- 28. Bottoni
- 29. Sliders MAC OS 8
- 30. ?
- 32. Buona affordance: i pezzi si incastrano solo nel modo corretto
- 34. “ Big Silly Rubber Button” Amy Stone, 1997 http://www.mowa.org/work/buttons/bttns5.html
- 35. Da: SQL Windows Esempio: feedback facilmente interpretabile?
- 36. Una definizione di usabilità
- 41. “ Usabilità” è un concetto relativo Tre variabili indipendenti: ambienti obbiettivi utenti
- 46. Le tre dimensioni della usabilità usabilità
- 47. Un esempio
- 53. Profilo di apprendimento A B tempo usabilità Focus sull’utente novizio Focus sull’utente esperto
Hinweis der Redaktion
- This picture shows a projector screen in a conference room. The white screen is lowered from the ceiling in front of a blackboard. To the right of the screen are some electrical switches. Guess which switch raises and lowers the screen? The switch next to the screen? No, it's the switch farthest away from the screen!
- This picture shows a ceiling fan with a built-in light. The problem here is to figure out and remember which chain is for controlling the light and which is for the fan. One nice thing about this design is that the two chains have different pulls so you won't easily mistake them for each other.
- This picture is from a restaurant in Santa Barbara. There is no urinal in the men's restroom. The fixture in the corner affords a certain activity. To try to discourage this activity someone taped a small sign to the wall above the fixture. The sign says "This is a mop sink."
- We borrowed this portable stereo from a friend so we could play some music at our outdoor wedding. We put a CD in the CD player and then pressed the play button on the row of buttons next to the CD player. It didn't work. Careful study revealed that the row of buttons next to the CD player controlled the tape player! And the row of buttons that controlled the tape player? They are next to the CD player!
- Buona affordance
- BUONA AFFORDANCE
- CATTIVA AFFORDANCE Perhaps it was the designer's intention of presenting a visually balanced dialog, but we considered the inclusion of non-command buttons to be particularly unbalanced. Apparently, when there are commands that apply in certain contexts but not to the current context, their labels are hidden from the user, and a placeholder for the button is left. In a typical Windows application, the button is given a disabled appearance, not unlike that of the "Exit Profile Viewer" button, which despite its appearance, is the only selectable button.
- CATTIVA AFFORDANCE Many programmers admit to this problem in their early GUI applications. In this image, the developer has chosen to give the section labels a raised appearance. That's one way of ensuring that the user doesn't confuse them with the editable fields, but does it come as any surprise that users try to click on them?
- This message is generated by the SQL Windows development environment. It arises when the developer has typed an incorrect statement while writing a program. The available responses are meaningless: what does 'Yes' do - retain the incorrect statement? The really unfortunate aspect of these error messages is that programmers learn primarily through example. When the programming environment itself generates poor messages, and the sample programs contain poor messages, is it any wonder that the programmers will tend to write poor messages in their future applications?