Progressive delivery is a strategy that allows organizations to introduce new features to users incrementally, minimizing risks and avoiding the pitfalls of the "move fast and break things" mentality. This approach uses methodologies like feature flagging, which provides fine-grained control over which users can access new functionalities, enabling real-time changes without redeployment and reducing costs by not requiring additional infrastructure. Feature flags can be implemented through OpenFeature, an open standard that simplifies integration with in-house or commercial solutions, and are crucial for decoupling deployment from release, thus making continuous integration and continuous delivery (CI/CD) less daunting. Additionally, observability is vital in progressive delivery systems, allowing teams to monitor the impacts of changes effectively. Platforms like Dynatrace use feature flags to manage and observe deployments, ensuring a controlled and safe rollout process for new features or algorithms by monitoring individual user impacts and system performance.