Let’s go right to the point. Which vital industrial tasks ought to be relocated to distant cloud data centres and which ought to remain on location at the corporate edge? The query is that. What guidelines should industrial-grade service providers and critical-grade businesses adhere to? Almost all respond, “None” (see interviews, pages 8ff). That’s the problem about Industry 4.0: designing and implementing cutting-edge digital transformation infrastructure for vital industries is not simple. Almost everything is custom, and by the time it is signed off, the answer usually has a life of its own.