2. Complicated, Not Just Complex

There is one distinction worth carrying into every changequake, and most of the trouble I have watched leaders walk into came from missing it: the difference between a problem that is complicated and one that is complex.

A complicated problem has a knowable structure. It can be vast — a compiler, a payroll system, a suspension bridge — but it can be decomposed, planned, and executed, and an expert who follows the right steps will reliably reach the right result. A complex problem is different in kind, not degree. Its parts interact; its behaviour emerges from those interactions rather than from any single component; and the ground moves while you work, so the same action produces different results depending on when and where you take it. You cannot plan your way to the answer, because the answer does not yet exist. It has to be discovered by trying things and watching what happens.