WS Best Practice

[Hoda, Nadeem [USA]]

 
I have recently heard that one operation (method/function) per service
(WSDL) is a best practice for SOA/web services. 
 
Can anyone corroborate this?
 
I can see it being cleaner at the WSDL level, but as you expand your
service offerings it will be a maintenance/client headache with dozens
of WSDLs/services for no apparent reason.
 
Also, are there good, reliable web service "best practices" guides?
 
Thanks, 
 
Nadeem