But don't forget that the territory will change underneath your feet. This is especially true if you write business software. A tectonic shift in the business c

But don't forget that the territory will change underneath your feet. This is especially true if you write business software. A tectonic shift in the business can make the assumptions you made a year ago completely invalid. This is complicated further by the fact that good software will drive the business. So you will always be creating new problems because you're driving the business into new areas and capabilities that simply weren't possible before. So this makes it doubly important to make sure your software can change in small ways over time. It's not just trying to navigate the moors at night with a torch, it's like trying to navigate the desert at night with a torch. The sand will move under your feet.