Williams, James R. <br/><br/>
Developing performance support for computer systems : a strategy for maximizing usability and learnability / 
James R. Williams 
 - Boca Raton:  CRC Press,   2004 
 - viii, 372 p.:   ill.;   25 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0415326400 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer systems<br/>Performance--Management