05 1 artifacts

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Lectures for the course "Ergonomics applied to the usability of web pages and apps" held at the School of design of Politecnico di milano in the first semester of 2021-2022 academic year

Design

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 2
Artefacts
Considerations on man made tool
development
Needs/artifacts cycle

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 3
Man is a Tool-Making Animal

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 4

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 5
How artifacts are developed?
www.museum.ie
ksiezycowahipoteza.wordpress.com

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 6
The static vision
Form follows function
task artefact

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 7
Every artefact, also the simplest, exists in several versions

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 8
The dynamic vision
Form follows failure
task artifact
8

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 9

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 10
Humble telescope

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 11
Corollaries
• The perfect artefact does not exist
• Everything can be made better… and will be
•
• Every artifact will exist in several versions…
• … specially when in used to support complex
tasks ...as in WEB pages and interfaces
https://it.wikipedia.org/wiki/Panta_rei
(1)

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 12
Example: paper clips
1896

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 13
Not always good form comes immediately

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 14
1

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 15
1

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 16
1

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 17
And the winner is…

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 18
1

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 19
roberto dadda
1

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 20

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 21
task
artefacts
Tools does non only satisfy needs,
tools changes and creates them!

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 22
Mimeograph

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 23
Xerox, 1949
IBM 3800 in 1976
Apple laserwriter 1985
1959

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 24
Failure identification: not always easy
Abraham Wald 1902-1950
De Havilland Mosquito (UK)

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 25
Wald’s insight and reasoning was based
on understanding what we now call
survivorship bias. Bias is any factor in
the research process which skews the
results. Survivorship bias describes the
error of looking only at subjects who’ve
reached a certain point without
considering the (often invisible) subjects
who haven’t.

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 26
Computer, Eniac & CRC102A

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 27
roberto dadda
“As tools are introduced and
used, a co-evolution will occur
between the tools and the
people using them”
D.C.Engelbart
2

www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 28
Usability
Roberto DADDA
roberto@dadda.it
www.dadda.it
Skype, Facebook e Twitter robertodadda

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05 1 artifacts

1. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 1 ERGONOMICS APPLIED TO THE DESIGN OF USABLE WEB PAGES AND APPS Roberto DADDA and Paolo NEGRI

2. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 2 Artefacts Considerations on man made tool development Needs/artifacts cycle

3. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 3 Man is a Tool-Making Animal

4. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 4

5. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 5 How artifacts are developed? www.museum.ie ksiezycowahipoteza.wordpress.com

6. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 6 The static vision Form follows function task artefact

7. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 7 Every artefact, also the simplest, exists in several versions

8. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 8 The dynamic vision Form follows failure task artifact 8

9. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 9

10. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 10 Humble telescope

11. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 11 Corollaries • The perfect artefact does not exist • Everything can be made better… and will be • • Every artifact will exist in several versions… • … specially when in used to support complex tasks ...as in WEB pages and interfaces https://it.wikipedia.org/wiki/Panta_rei (1)

12. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 12 Example: paper clips 1896

13. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 13 Not always good form comes immediately

14. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 14 1

15. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 15 1

16. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 16 1

17. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 17 And the winner is…

18. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 18 1

19. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 19 roberto dadda 1

20. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 20

21. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 21 task artefacts Tools does non only satisfy needs, tools changes and creates them!

22. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 22 Mimeograph

23. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 23 Xerox, 1949 IBM 3800 in 1976 Apple laserwriter 1985 1959

24. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 24 Failure identification: not always easy Abraham Wald 1902-1950 De Havilland Mosquito (UK)

25. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 25 Wald’s insight and reasoning was based on understanding what we now call survivorship bias. Bias is any factor in the research process which skews the results. Survivorship bias describes the error of looking only at subjects who’ve reached a certain point without considering the (often invisible) subjects who haven’t.

26. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 26 Computer, Eniac & CRC102A

27. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 27 roberto dadda “As tools are introduced and used, a co-evolution will occur between the tools and the people using them” D.C.Engelbart 2

28. www.dadda.it roberto@dadda.it Excellence in usability 1st semester 2021-2022 28 Usability Roberto DADDA roberto@dadda.it www.dadda.it Skype, Facebook e Twitter robertodadda

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