Reinforcing loops

At McKinsey, we used to call this Business Dynamics, mapping reinforcing and opposing forces using arrows. The concept is borrowed from systems theory in mathematics and physics. These circles can make a great chart to show the main growth drivers behind your business.

The notorious US army spaghetti chart is a more complicated execution of the same principle. Contrary to many critical review, I actually liked it as a visualization of the incredibly complex situation over there.