Dr. Alistair Cockburn is one of the 17 signatories of the Agile Manifesto, has written books on both Object Oriented Programming, Use Cases and Agile Software Development. In the recent years he created the Heart of Agile movement, to capture the essence and intention of agile. The Heart of Agile consist of only Collaborate. Deliver. Reflect. Improve. See https://heartofagile.com