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Re: Formal Twiddler one-handed chording keyboard study results

Cool Thad been after something like this for a while can you post it as an 
attachment? What texts did you use, how did you combine all the words-
numbers-punctuation that people use in mob phone and typing based 
messages  ?

How did you counter balance and what statistical methods did you use to 
analyse the data?

Did you assess the task load and compare it to other devices within the 
same group ?

As the twiddler is really a mobile device, when you used it while mobile 
was there a difference from just standing or sitting infront of a 
monitor ??

 Hope all goes well at CHI 

 Alan

Quoting ThadV Starner <>:

> Happy new year everyone!  
> 
> To start things off right on the list, I thought
> I'd share some results my students and I have
> been working on.  We finally did a formal study
> on the learnability of the Twiddler.  The paper
> will soon be on our publications page
> www.cc.gatech.edu/ccg
> and it will appear at this year's CHI conference
> in Vienna.  The abstract is below.
> 
> Results?:  Better than expected. average 26.6wpm in <
> 7 hours of practice, learning curves faster than
> anything else we've found in the literature so far 
> (including desktop keyboards), touch typing mostly
> in the first session (using our tutor), and expert 
> rates in the 60-70wpm range.
> 
>                                 Thad
> ------------------------
> An experienced user of the Twiddler, a one--handed
> chording keyboard,
> averages speeds of 60 words per minute with
> letter--by--letter typing
> of standard test phrases. This fast typing rate
> coupled with the
> Twiddler's 3x4 button design, similar to that of a
> standard
> mobile telephone, makes it a potential alternative to
> multi--tap for
> text entry on mobile phones. Despite this similarity,
> there is very
> little data on the Twiddler's performance and
> learnability. We present
> a longitudinal study of novice users' learning rates
> on the
> Twiddler. Ten participants typed for 20 sessions using
> two different
> methods. Each session is composed of 20 minutes of
> typing with
> multi--tap and 20 minutes of one--handed chording on
> the Twiddler. We
> found that users initially have a faster average
> typing rate with
> multi--tap; however, after four sessions the
> difference becomes
> negligible, and by the eighth session participants
> type faster with
> chording on the Twiddler. Furthermore, after 20
> sessions typing rates
> for the Twiddler are still increasing.
> 
> 
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**********************************************************
Alan Chamberlain 
Department of Computer Science
Loughborough University
Loughborough
Leicestershire
LE11 3TU
Tel: +44 1509 222098  

**********************************************************
Human Computer Systems Research Group (HCS)
**********************************************************

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