Let's talk mental models. The biggest one we have in IT.
In the broad system of IT management, we often hear of three stages, “Plan/Build/Run.” We make plans for a new IT system, we construct it, and we run it.
IT organizations often structure themselves and communicate to a large degree along these lines. I’ve used them myself in any number of writings. However, I have come to question the usefulness of “Plan-Build-Run” (which I’ll abbreviate PBR) as a mental model for understanding and guiding IT management.
While it pervades IT management thinking, and can clearly be seen in the structures of frameworks like ITIL and COBIT, PBR is ill suited for the demands of 21st century IT management. I believe it is fundamentally a statement of waterfall thinking.