Well, I took a chance and emailed Dr. Moundridou in Greece to see if her Algebra expert tutor is one answer to extending students learning through an artificially intelligent algebra tutor.  Here’s what she said.

From: “Maria Moundridou” <mariamou@otenet.gr>
Subject: RE: Web Based Authoring Tools for ITS
Date: Sun, 23 Mar 2008 19:49:37 +0200

Dear Gordon,

Thank you for your interest in our work.
Unfortunately, WEAR is not online anymore. It was developed by me and served
as the product and test-bed of my phd research. As it was not part of any
funded project, its development and maintenance froze by the time I
completed my PhD.

Concerning your research, I recommend “PAT Algebra Tutor” by Ken Koedinger,
John Anderson, et al. I think they are having some experimental versions of
their systems available online and you will find dozens of publications
reporting on PAT.

Best regards,
Maria

————————————————
Maria Moundridou
Assistant Professor
General Department of Education
School of Pedagogical and Technological Education (A.S.PE.T.E.)
141 21 Ν.Ηeraklion, Αthens, GR
e-mail: mariam@aspete.gr

So as you can see there may be something out there.

Stay tuned to hear more about PAT in the upcoming weeks…