By Chris Watkins
By Hughes, Susan
By Gibson, Janet
By Watson
By Butterworth, John
By Wren, Wendy
By SPMG, Scottish Primary Maths Group
By IMPACT Project Uni Of N.London
By Leonard, M.G., M.G. Leonard
By Thomson, Ruth
By Chrisp, Peter
By Kumon
By Mayhew, James
By Bentley, Diana
By Peter Patilla, Patilla, Peter
By Howe, Linda
By Odam, Professor George, etc.
By Clarke, Brenda, Dennis, Peter
By Eaude, Tony
By Faye Gardner
By Evans, Joy, Moore, Jo Ellen
By Gadsby, Paul, Matthews, Jenny, Thomson, Ruth
By Pickford, Tony
By Shuter, Jane