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Allspaw, John, and Paul Hammond — 10+ Deploys Per Day: Dev and Ops Cooperation at Flickr.

Allspaw, John, and Paul Hammond. "10+ Deploys Per Day: Dev and Ops Cooperation at Flickr." Velocity conference presentation, 2009.

Focus in observatory

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Coupling

Cohesion, Consequence, and the Architecture of Responsibility

A practical framework for seeing where systems are tightly joined, where they drift apart, and how those coupling choices shape accountability over time.