The 80/20 principle  the secret of achieving more with less 
Richard Koch.  
 - Rev. paperback ed., reprinted. 
 - London  Brealey  2001.  
 - X, 302 S  Ill  23 cm. 
<br/><br/><label>ISBN: </label>1857881672 (hbk.) 1857881680 (pbk.) 9781857881677 (hbk.) 9781857881684 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Effizienz.<br/>Management.