[stcusesig_l] Using Captcha in Registration

Wed Jul 2 01:38:12 MDT 2008

I really appreciate the quick responses from Whitney & Caroline, they 
really helped me put forward the thoughts and the use of CAPTCHA in our 
product; we would be using simpler method instead of CAPTCHA to avoid the 
automated computer response for the external use of the registration 
process. As mentioned by Caroline we plan to use some words to be 
re-entered by users in revers order if this pass the usability testing or 
we would switch to CAPTCHA.

Thank you for the inputs Whitney & Caroline

Best Regards,
Sandeep Rathod
Sr. HCI Designer
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Zycus - SAVE WITH EASE 
Email: sandeep.rathod at zycus.com | Tel. Desk: +91 22 6640 7676 (Extn: 7689)
Website: http://www.zycus.com
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"Whitney Quesenbery" <whitneyq at gmail.com> 
Sent by: stcusesig_l-bounces+sandeep.rathod=zycus.com at mailman.stc.org
07/01/2008 08:10 PM

Please respond to
STC Usability and UX discussion group <stcusesig_l at mailman.stc.org>

To
"STC Usability and UX discussion group" <stcusesig_l at mailman.stc.org>
cc

Subject
Re: [stcusesig_l] Using Captcha in Registration

You can learn about how to use CAPTCHA accessibly in the W3C/WAI Web
Content Authoring Guidelines. It's part of Checkpoint 1.1
http://www.w3.org/TR/WCAG20/#text-equiv

The relevant text reads:

1.1.1 Non-text Content: All non-text content that is presented to the
user has a text alternative that serves the equivalent purpose, except
for the situations listed below. (Level A)

* CAPTCHA: If the purpose non-text content is to confirm that content
is being accessed by a person rather than a computer, then text
alternatives that identify and describe the purpose of the non-text
content are provided, and alternative forms of CAPTCHA using output
modes for different types of sensory perception are provided to
accommodate different disabilities.

There are links to further information to help you understand the
reasons for these checkpoints, and different "sufficient techniques"
(that is, acceptable methods) to meet the checkpoint.

On Tue, Jul 1, 2008 at 6:00 AM, Caroline Jarrett
<caroline.jarrett at effortmark.co.uk> wrote:
> The aim of a 'captcha' is to try to ensure that the entity filling out
> the form is a human, as opposed to an automated device that's just
> trying to spam you.
>
> It's extra work for your real users, and poses some definite
> accessibility problems.
>
> To decide whether to use one or not, figure out:
> - how annoying it is going to be for your real users
> - how to solve the accessibility problems
> - how much effort it will be to remove spam items from your database
> - whether anyone is trying to spam you anyway.
>
> Then balance the different factors.
>
> I'd say, it's nearly always better to avoid the use of a captcha. I've
> seen a few places where there's some simpler method of figuring out
> whether the person is a human, for example asking the person to retype
> some obvious (ordinary) text that requires a bit of understanding to
> resolve (e.g. "Please type the letters YES in this box" - I'm making
> this up but it's an example). This is more accessible, but may still
> pose problems for some types of disability especially cognitive. So on
> the whole, I'd avoid these things altogether until you have proved
> that you're getting a seriously difficult spam problem.
>
> Your circumstances may be different.
>
> Best,
>
> Caroline Jarrett
> caroline.jarrett at effortmark.co.uk
> 07990 570647
>
> Effortmark Ltd
> Usability - Forms - Content
>
> We have moved. New address:
> 16 Heath Road
> Leighton Buzzard
> LU7 3AB
> ----- Original Message -----
> From: <Sandeep.Rathod at zycus.com>
> To: <stcusesig_l at mailman.stc.org>
> Sent: Tuesday, July 01, 2008 11:54 AM
> Subject: [stcusesig_l] Using Captcha in Registration
>
>
> : Would like to know what is the importance of using 'Captcha' (some
> spanned
> : words forcing users to enter as they read with refresh
> functionality) and
> : Why one should use this on registration page; If the only purpose of
> this
> : application is to get all the text digitize that were written before
> : computer age. I personally think that it is a kind of a restriction
> for
> : user to register quickly when the words are not readable on the
> screen.
> :
> : I am preparing a self registration page where I have been asked by
> my
> : Product Management team; I am trying to figure it out what is the
> best way
> : to implement this functionality and
> :
> :
> : Best Regards,
> : Sandeep Rathod
> : Sr. HCI Designer
> : This message has been comprehensively scanned for viruses,
> : please visit http://www.avg.power.net.uk/ for details.
> :
>
>
> 
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-- 
Whitney Quesenbery
www.wqusability.com

Storytelling for User Experience Design
www.rosenfeldmedia.com/books/storytelling
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