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Re: direct and spatial mapping to functionalities

From: <thatch@us.ibm.com>
Date: Sun, 3 Oct 1999 11:29:31 -0500
To: Marja-Riitta Koivunen <marja@w3.org>
cc: w3c-wai-ua@w3.org
Message-ID: <852567FF.005AF98D.00@d54mta08.raleigh.ibm.com>


MK: Does everybody else understand this perfectly and agree that the current
wording reflects it? Then I will stop.

JT: I am not going to ask you to stop, but even if 2.1 is flawed
(and I don't think it is) it should remain as is. The wording is
unequivocal and clear. It is, in my opinion, the most important
checkpoint for access to software for multiple disabilities. Water
it down or generalize it and it will loose its focus and force.

2.1 By default and without additional customization, ensure that all
functionalities offered by the user agent are accessible using the keyboard.

Jim Thatcher
IBM Special Needs Systems
www.ibm.com/sns
HPR Documentation page: http://www.austin.ibm.com/sns/hprdoc.html
thatch@us.ibm.com
(512)838-0432


Marja-Riitta Koivunen <marja@w3.org> on 09/29/99 10:56:43 AM

To:   Ian Jacobs <ij@w3.org>
cc:   ian@w3.org, w3c-wai-ua@w3.org
Subject:  Re: direct and spatial mapping to functionalities




At 11:33 AM 9/29/99 -0400, Ian Jacobs wrote:
>Marja-Riitta Koivunen wrote:
>>
>> While thinking about conformance I was looking the guidelines and
>> checkpoints again. I still don't like the word keyboard in guideline 2. I
>> also think keyboard access is not what we want to say in  many checkpoints
>> e.g. in
>>
>> 2.1 By default and without additional customization, ensure that all
>> functionalities offered by the user agent are accessible using the
keyboard.
>>
>> So you could use the keyboard arrow keys to point and some other key to
>> select and still conform? Or what about my laptop keyboard with a finger
>> mouse built into it?
>>
>> I think we want to say something about offering direct mapping from input
>> device keys to the functionalities as opposite to spatial mapping with
>> pointing and graphical objects. In the first case we usually have many keys
>> or key combinations that the user needs to remember but no need to point or
>> see. In the latter case we need to remember just few keys and some way to
>> point in 2D (or 3D). If we can present the activating of functionalities
>> with graphical objects or by using force feedback it often helps memory but
>> it is slower to get to the functions.
>>
>> I think both mappings are important. The point&click UI with explorable
>> memory aid (e.g. graphical  objects, sound map, force feedback map) helps
>> cognitively disabled (and everyone with human memory) the direct mapping
>> helps motorically disabled because some key or morse code etc. can be
>> mapped directly to the function without need to go through the spatially
>> located object.
>
>There is an analogy with serial access to links (which provides
>context as-you-go) and direct access (which is faster, but requires
>more experience). Explaining the utility of both for access
>to UA functionality would be useful (we already do so for navigation).
>
>However, I think your abstraction overlooks the need that motivated
>this Guideline: assistive technology today relies on software using
>the standard OS keyboard API (please correct me if I'm wrong). This
>Guideline is less abstract than others since it addresses today's
>technology and today's requirements. Device-independence captures
>the principle while talking about the keyboard API captures today's
>need.

Guideline is not a checkpoint, so it is not what people check, it does not
even have priorities. It is put higher up because it is important, still
this guideline does not need to be conformed always. So I'm confuced.

Then I look the actual checkspoint under the guideline, such as

2.1 By default and without additional customization, ensure that all
> functionalities offered by the user agent are accessible using the keyboard.
>
> So you could use the keyboard arrow keys to point and some other key to
> select and still conform? Or what about my laptop keyboard with a finger
> mouse built into it?

And I'm even more confused. Here I agree we should mention keyboard, but
when we have mentioned it, it seems not to help. Can I use some of my
keyboard keys (or even my keyboard mouse for pointing) and conform to this?
I don't think this is what we want.

Does everybody else understand this perfectly and agree that the current
wording reflects it? Then I will stop.

Marja


>I am not yet convinced (but still open!) that presenting the
>Guideline as requiring direct v. serial access to UA functionality
>will adequately address the requirement of today's technology.
>
>Please let me know if my comments reflect an understanding of
>your suggestion.
>
>Thank you,
>
> - Ian
>
>
>> A separate thing is then how to present all this. If the user can see she
>> can have memory aid on the screen (or even paper) also for directly mapped
>> keyboard events, if she cannot she needs to rely more on memory. On the
>> other hand she may use spatial mapping and exhaustive spatial search with
>> sound or force feedback to help her memory. The graphical object model
>> provides the memory aid naturally but can also be badly designed.
>>
>> Marja
>
>--
>Ian Jacobs (jacobs@w3.org)   http://www.w3.org/People/Jacobs
>Tel/Fax:                     +1 212 684-1814
>Cell:                        +1 917 450-8783
>
Received on Sunday, 3 October 1999 12:34:07 GMT

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