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Re: ACTION: technique icon totals

From: Jan Richards <jan.richards@utoronto.ca>
Date: Wed, 24 Jul 2002 11:34:58 -0400
Message-ID: <3D3EC922.4110ABFC@utoronto.ca>
To: w3c-wai-au@w3.org

Charles,

Sorry for the confusion. I am NOT saying that a technique is less
"useful" if it applies to more than one category (in fact it's possibly
more useful). I AM trying to measure the usefulness of the
categorization scheme we have chosen. In other words, "is the
categorization scheme making divisions among the techniques that are
useful for tool developers". Here are two examples of what I mean:

1. An efficient categorization scheme is male/female (it is ~100%
efficient in dividing people).

2. An inefficient categorization scheme is "people who drink
water"/"people who eat bread" (it is inefficient because so many people
fall into both categories)

If, as we have with ATAG, the efficiency of the categorization scheme is
low we may want to look at whether it is worthwhile to keep it. Of
course, my reordering proposal mentions that we might want to use a
different categorization scheme for each tier - to increase the
efficiency - but this may be too complicated.

Cheers,
Jan

Charles McCathieNevile wrote:
> 
> I don't understand your assumption that efficiency is implied by each
> technique being useful for exactly one type of tool. Since it is such an
> important basis for the rest of your analysis, could you please explain it
> further?
> 
> Cheers
> 
> Charles
> 
> On Wed, 24 Jul 2002, Jan Richards wrote:
> 
> >
> >Matt,
> >
> >Thanks for providing the raw count. A quick and dirty analysis shows
> >that:
> >
> >In the worst case scenario (0% efficiency), each technique would apply
> >to every category, so the categories mean nothing:
> >
> >   # of icons = # of techniques * # of categories
> >
> >In the best case scenario (100% efficiency), each technique would belong
> >to only one category, so:
> >
> >   # of icons = # of techniques
> >
> >So, for the whole document:
> >
> >> Markup Editing Tools: 96
> >> Multimedia Creation Tools: 75
> >> Content Management Tools: 78
> >> Programming Tools: 55
> >> Conversion Tools: 6
> >
> ># of Techniques: 106
> >BEST CASE = 106 Icons
> >WORST CASE = 530 Icons
> >ACTUAL = 310 Icons (~52% efficiency)
> >*EFFICIENCY = 100% - (ACTUAL - BEST CASE)/(WORST CASE - BEST CASE)
> >
> >But some guidelines are more efficient than others:
> >
> >> G6:
> >> Markup Editing Tools: 12
> >> Multimedia Creation Tools: 12
> >> Content Management Tools: 12
> >> Programming Tools: 12
> >> Conversion Tools: 0
> >> None specified: 2
> >
> ># of Techniques: 12
> >BEST CASE = 12 Icons
> >WORST CASE = 60 Icons
> >ACTUAL = 48 Icons (~25% efficiency)
> >
> >> G7:
> >> Markup Editing Tools: 23
> >> Multimedia Creation Tools: 12
> >> Content Management Tools: 10
> >> Programming Tools: 7
> >> Conversion Tools: 0
> >> None specified: 1
> >
> ># of Techniques: 28
> >BEST CASE = 28 Icons
> >WORST CASE = 140 Icons
> >ACTUAL = 52 Icons (~79% efficiency)
> >
> >Unfortunately much of our efficiency is provided by the fact that the
> >Conversion Tool category is used just 6 times. Leaving out this
> >category, the efficiency scores are:
> >
> >All techniques: 38%
> >G6: 0% (all techniques apply to all 4 categories)
> >G7: 71%
> >
> >--
> >Cheers,
> >Jan
> >
> >/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
> >
> >Jan Richards
> >
> >User Interface Design Specialist
> >Adaptive Technology Resource Centre (ATRC)
> >University of Toronto
> >
> >@: jan.richards@utoronto.ca
> >P: (416) 946-7060
> >F: (416) 971-2896
> >
> >/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
> >
> 
> --
> Charles McCathieNevile    http://www.w3.org/People/Charles  phone: +61 409 134 136
> W3C Web Accessibility Initiative     http://www.w3.org/WAI  fax: +33 4 92 38 78 22
> Location: 21 Mitchell street FOOTSCRAY Vic 3011, Australia
> (or W3C INRIA, Route des Lucioles, BP 93, 06902 Sophia Antipolis Cedex, France)


/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

Jan Richards

User Interface Design Specialist
Adaptive Technology Resource Centre (ATRC)
University of Toronto

@: jan.richards@utoronto.ca
P: (416) 946-7060
F: (416) 971-2896

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Received on Wednesday, 24 July 2002 11:35:04 GMT

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