SIGIA-L Mail Archives: RE: [Sigia-l] Card Sorting: How Many Users to Test
RE: [Sigia-l] Card Sorting: How Many Users to Test
> From: Eric Scheid
> ahh ... surely there's something controversial in Jakob's
> latest AlertBox...
> > You must test fifteen users to reach a correlation of 0.90, which
> > is a more comfortable place to stop. After fifteen users,
> > diminishing returns set in and correlations increase very little:
> > testing thirty people gives a correlation of 0.95 -- certainly
> > better, but usually not worth twice the money. There are hardly
> > any improvements from going beyond thirty users: you have to test
> > sixty people to reach 0.98, and doing so is definitely wasteful.
Why did you think the above was controversial?
When replying, please *trim your post* as much as possible.
*Plain text, please; NO Attachments
Searchable list archive: http://www.info-arch.org/lists/sigia-l/
Sigia-l mailing list -- post to: Sigia-l_at_asis.org
Changes to subscription: http://mail.asis.org/mailman/listinfo/sigia-l
This archive was generated by hypermail 2.1.6
: Mon Jul 19 2004 - 20:15:23 EDT