To make knowledge productive, we will have to learn to see both forest and tree. We will have to learn to connect.

Knowing a great deal is not the same as knowing what to do with it. Drucker suggests that knowledge becomes productive only when we can hold two views at once: the detailed view of the single tree and the wider view of the forest. Specialists tend to see the tree with great precision, while generalists see the forest but miss the detail. Real value appears when the two are linked, when a fact is placed in a context and a context is tested against facts.

The idea rests on Drucker's long-standing view that modern society runs on knowledge workers, people whose expertise is narrow and deep. He argued that this specialization is powerful but also fragmenting, so organizations and individuals must deliberately connect what specialists know to the purpose it serves.

A practical example: imagine you work in marketing and have just read a detailed report on customer complaints. Instead of filing it away, you might spend an afternoon with someone from customer support and someone from product design, asking how each of them sees the same problem. Your detail gains meaning, and their perspectives gain evidence.