Mason, John,  1944- <br/><br/>
Designing and using mathematical tasks / 
John Mason and Sue Johnston-Wilder. 
 - [2nd ed.] 
 - St. Albans :  Tarquin,  2006. 
 - ix, 141p 
 - Researching mathematics learning Open University course ;  ME825 .
<br/><br/><label>ISBN: </label>1899618651 9781899618651