Thread Subject: FW: Summary of touch based controlsfrom3/14transcript

From: Gregg Vanderheiden
Date: Fri, May 18 2007 10:30 AM

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Gregg
-- ------------------------------
Gregg C Vanderheiden Ph.D.

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Vanderheiden
Sent: Friday, May 11, 2007 11:17 AM
To: 'TEITAC desktop/portable (hardware) subcommittee'
Subject: Re: [teitac-hardware] Summary of touch based
controlsfrom3/14transcript



Hmmmm



Seems to have a bunch of crossed categories.





By touch -biometric - I think we were talking about 'capacitive' screens
that required a connection to the human body. I'm not sure we should call
those biometric since biometric is mostly related to ID.



And touch screens that are not capacitive are in fact almost all mechanical
- it is just at a very small scale and involves flexible conductors.







I think we have



1. Human contact controls (capacitive and heat sensitive)
2. Light touch controls (if you add "mechanical" it would exclude
'human touch controls' but then confuses people who can't think of a
touchscreen as being mechanical)
3. Other Physical controls.



3 can't be titled "mechanical' or it would include #2



Perhaps we can't easily sort these.



So we should just have

1. a rule about Human Touch (that you need a non-human touch control
as well)
2. a rule about any light touch (that you need a method for doing same
thing that is 'tactilely discernable without activation"
3. the rules for other physical





Or perhaps we put them all together into one provision.



- all functionality must be operable from controls which

o are tactilely discernable without activation

o do not require contact or connection with human body parts

o do not require more than XXX pressure

o do not require simultaneous actions

o do not require pinching, twisting of the wrist or tight grasping
(per clarification from Access Board)

o (others provisions if I missed one)





Then all we need to say is that you have to be able to tactilely find the
controls (above) without encountering touch activated controls that a person
would not know were there .





This would allow touch screens, touch controls etc as long as there were
OTHER ways of doing things and the touch controls weren't intermixed with
the physical controls or something where the person couldn't use the
physical controls without activating the 'tactilely invisible' touch
controls.





We also need to keep "SoftKeys" in mind. You can find the key but you
have no idea what it's meaning at any point in time is.








Gregg
-- ------------------------------
Gregg C Vanderheiden Ph.D.






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Sent: Friday, May 11, 2007 8:40 AM
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Subject: Re: [teitac-hardware] Summary of touch based controls
from3/14transcript

Additionally, this summary and the applicable section of the transcript have
been posted to the WIKI.



http://teitac.org/wiki/Touch_Controls



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Sent: Friday, May 11, 2007 8:38 AM
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Subject: [teitac-hardware] Summary of touch based controls from
3/14transcript



This is an attempt to summarize key points from a transcript.
Unfortunately, there are sections that were not very clear.

Mechanical and touch sensitive controls need to be separated. In fact there
may be 3 types of controls to consider:

1. Mechanical

2. Touch sensitive

3. Touch dependent (biometric)

Mechanical controls may not be the best alternative to a touch sensitive
control - language should be drafted to allow alternatives

Touch screen versus touch sensitive:

* touch screen more of a biometric technology

* touch sensitive is still a "mechanically" driven solution but there
is greater control of the sensitivity and timing characteristics. The
example give was adaptive controls on a microwave

Potential touch sensitive characteristics:

* Control must be tactilely discernible

* Control must have a mechanism to minimize accidental activation due
to touch

* Control characteristics, such as time to registration of signal,
pressure, etc., should be adjustable

Potential touch screen content:

* An alternative method to achieve touch screen control functions must
be provided via an alternative format or interact (for example voice
control).

Rob Nerhood | Experience Design Group | Ergonomics Engineer
Dell, Inc. | One Dell Way | Round Rock, Texas 78682 - 7000
direct 512.723.2763

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