Goodhart’s Law

Practically useful for anyone designing monitoring and evaluation. If you measure by the number of people reached, you get volume; if you measure by depth of engagement, you get something different. The finding that demographics explain only 2-3% of resilience variance while relational factors explain 27-43% is partly a Goodhart's finding: the easily measurable things are not the things that matter most.

When you measure the wrong thing, people optimise for the wrong thing