University of Warwick | Mathematics Education Research Centre | Personal Site (davidtall.com)

Graphic Calculus Software | GraphicCalculus.co.uk

PME Home Page | PME 26 | PME 27

Photographs from PME 25 in Utrecht | Photographs from PME 26 in Norwich

Ask ERIC Eric Database of publications, including research papers

Other useful links:
CHEST software prices for staff and students
Educational Software Orders from Pugh Computers Ltd (sometimes slow in responding to e-mail!)
Book Brain for cheapest UK net quotes for books.
Allwhois.com to find out ‘who is’ the owner of any web address.