<p>The USMBOK already discusses the different approach and skills required to managing strategic and tactical suppliers - calling the former 'service providers'. Isn't this exactly what SIAM is about? Also, seems the SIAM movement is at best UK centric and as yet nowhere near as advanced as a movement as say DevOps.  What chance you could extend the current USMBOK guidance and bridge across to SIAM - An introduction to SIM and perhaps a fundamentals?</p>