references/figures/peter-drucker.md

# Peter Drucker

## Contribution

A decision card for the Customer-Centric Market Definition school. Use the principles, not the personality.

## Principles

- business purpose begins with creating a customer.
- marketing and innovation are central commercial functions.
- results exist outside the organization.

## Apply when

- The current decision matches this figure's documented area of contribution.
- The principle can be tied to evidence, a mechanism, or a testable assumption.

## Do not infer

- The figure's name does not settle a disagreement.
- Historical work is not evidence that a current market fact is true.
- Do not mimic personal voice, mannerisms, or biography.

## Connected theories

- `customer-creation`

## Counterweights

- Compare with `philip-kotler` when the principle would otherwise become a universal rule.

## Sources

- `source:drucker-practice-management`