From Thinking in Systems - Donella H. Meadows.
Chapter 6 : Leverage Points - Places to Intervene in a System
12 - Constants and parameters
11 - Buffers (stocks size relative to their flows)
10 - Stock and flow structures
9 - Delays (relative to the rate of system change)
8 - Balancing feedback loops
7 - Reinforcing feedback loops
6 - Information flows
5 - Rules (Inventives, punishments, constraints)
4 - Self Organization (Power to add, change, or evolve system structure)
3 - Goals (The purpose or function of the system)
2 - Paradigms (Mindset in which the structure arise)
1 - Paradigm transcending (Being aware of paradigms)