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Which clippings match 'Iteration' keyword pg.1 of 1
16 JULY 2011

How and When Prototyping Practices Affect Design Performance

"How does the structure of prototyping practice affect learning, motivation, and performance? In this talk, I will describe research on iteration and comparison, two key principles for discovering contextual design variables and their interrelationships. We found that, even under tight time constraints when the common intuition is to stop iterating and start refining, iterative prototyping helps designers learn. Our results also demonstrate that creating and receiving feedback on multiple prototypes in parallel – as opposed to serially – leads to more divergent concepts, more explicit comparison, less investment in a single concept, and better overall design performance. This talk highlights relevant research in cognitive and social psychology and shares the results of our preliminary design studies."

(Steven Dow, 19 November 2009, Google Tech Talk)



applied researchcognitive psychology • common intuition • conceptualisation • contextual design • creative problem • Dan Schwartz • design performance • design studiesdesign thinkingdesignersdivergent conceptseggenquiryexperimentation • functional fixedness • Georgia Institute of Technology • GoogleTechTalk • HCIhuman-centred computinghuman-computer interactionhypothesisindustrial engineeringintuitioniteration • iteration and feedback • iterative designiterative prototyping • Karl Duncker • learning • parallel prototyping • problem solving researchproblem-solvingprototyping • prototyping practices • psychologyreal-world design • refinement • Scott Klemmerserial prototypingsocial psychologyStanford University • Steven Dow • theory buildingUniversity of Iowa


Simon Perkins
22 MARCH 2011

WinDirStat: Windows Directory Statistics

"When in 2003 I came across the KDE program KDirStat (, I was fascinated and enthusiastic about it, as it is probably the same with many others. I had been thinking of writing a disk usage tool before, and saw: that's it!

SequoiaView ( was around, but KDirStat's concept of coupling a tree list view with a treemap was unrivaled, and I didn't find anything equivalent for MS Windows. So I wrote WinDirStat, using Mark Bruls, Kees Huizing, Jarke J. vanWijk, and Huub van de Wetering's papers on squarified treemaps ( and cushion treemaps (

I didn't worry too much about the functionality but simply cloned KDirStat. The pacman is not my idea, the extension list is. I tried to size and position each GUI element optimally and to avoid modal dialogue boxes. The program should output much information while requiring few user input. When I thought it was complete, I gave it to my sister and watched her interaction with the software. That gave me another two weeks of work to do. This procedure, together with the testplan, secured WinDirStat's quality.

Meanwhile, a colleague of mine wrote Disc Inventory X (, a clone for Mac OS X.

That's the story so far. Oliver has taken responsibility for the project, many translations have been contributed. I've largely switched to Linux and observe WinDirStat's amazing download numbers. I hope we can provide some new version slowly but surely."

(Bernhard Seifert, 2010–07–28)



2003application • Bernhard Seifert • chartdatadata visualisation • Disc Inventory X • disk usage • GUIhierarchy • Huub van de Wetering • ICTinformation aestheticsinnovationiteration • Jarke J. vanWijk • KDE • KDirStat • Kees Huizing • Mac OS X • Mark Bruls • MicrosoftMicrosoft Windows • MS Windows • Oliver Schneider • Pac-Manproduct design • SequoiaView • softwaresoftware programmesolution • squarified treemaps • technologytool • tree list view • tree structure • treemap • visualisation • WinDirStat


Simon Perkins

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