Checkland, Peter <br/><br/>
Soft systems methodology :  a 30-year retrospective / 
 Systems, thingking, systems practice 
Peter Checkland 
 - Chichester :  John Wiley,  1999 
 - 1 v. (various pagings) :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references and indexes 
<br/><br/><label>ISBN: </label>0471986062 (pbk. : alk. paper)  RM672.75 
<br/><br/><label>Subjects--Topical Terms: </label><br/>System theory