Note to self: 5 focussing steps by Goldratt

Introduced by Eliott Goldratt in The Goal.

1. Identify the system constraint
2. Exploit the constraint
3. Subordinate everything to the constraint
4. Elevate the constraint
5. Prevent inertia from becoming the constraint

More details here: https://www.tocinstitute.org/five-focusing-steps.html