Example of accessible CAPTCHAS that work well

Dear WAI-EO editors,

Regarding the The W3C WAI Education and Outreach Working Group (EOWG) 
invitation to comment on:
     Before and After Demonstration (BAD)
     http://www.w3.org/WAI/demos/bad/


It would be good that BAD include a best practice example of CAPTCHAS

Regards,
Phill Jenkins, 
IBM Research - Human Ability & Accessibility Center
http://www.linkedin.com/in/philljenkins


----- Forwarded by Phill Jenkins/Austin/IBM on 11/17/2011 08:16 AM -----

From:   "Lars Ballieu Christensen" <lbc@sensus.dk>
To:     <sec508@trace.wisc.edu>
Date:   11/17/2011 08:10 AM
Subject:        [SEC508] Examples of accessible CAPTCHAS that work well
Sent by:        sec508-admin@trace.wisc.edu



Dear all,
 
Greetings. 
 
I’m looking for examples of CAPTCHAS that are both accessible from a 
formal compliance point of view and work well with a multitude of users. 
Any references are highly appreciated.
 
Kind regards
 
Lars 
----
Lars Ballieu Christensen 
Rådgiver/Adviser, Sensus ApS
Specialister i tilgængelighed/Accessibility Consultants 
Tel: +45 48 22 10 03 – Mobil: +45 40 32 68 23 - Skype: Ballieu
Mail: lbc@sensus.dk – Web: www.sensus.dk & www.robobraille.org 
 
Vi arbejder for et tilgængeligt og rummeligt informationssamfund
Working for an accessible and inclusive information society