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Leverage and intervention

Where and how to intervene in a system to create change that sticks.

Most interventions fail. Not because people don’t try hard enough, but because they push in the wrong place, at the wrong level. Systems thinking gives you a map of where the high-leverage points are - and why the obvious ones are usually the weakest.

Donella Meadows identified twelve places to intervene in a system, from tweaking numbers (weak) to changing the mindset that created the system in the first place (powerful). The practical skill isn’t memorising the list - it’s developing the instinct for which level you’re operating at and whether there’s a more powerful one available.

This theme is about that instinct. How to find leverage. How to anticipate resistance. How to make small moves that shift the whole system rather than big moves that get absorbed.

9 concepts

Catalytic Mechanisms
Small structural changes that reliably produce the right behaviour without constant enforcement
Constraints
Limitations that shape behaviour - sometimes adding one creates better outcomes than removing one
Intervention Side Effects
Every action in a complex system produces effects beyond the one you intended
Leverage Points
The places in a system where a small change can shift everything
Nudges
Subtle changes to the choice environment that steer behaviour without restricting options
Policy Resistance
When a system fights back against your attempt to change it
Requisite Variety
To stay in control of a system, you need at least as many responses as the system has ways of changing
Second-Order Effects
The consequences of the consequences - what happens after the first thing happens
System Traps
Predictable structural failures that show up across every kind of system