Which of the following life-cycle models is based on a continuous flow of work?

The Lean life-cycle model is founded on the principles of continuous flow of work, emphasizing efficiency and the elimination of waste within processes. In Lean, work items are processed in a manner that enables a steady stream of output, ensuring that resources are used optimally and that cycles of work are uninterrupted. This approach allows for quicker delivery of value to customers and a more responsive environment to changing demands.

While Continuous Delivery Agile focuses on the practice of frequently releasing small changes to production, it does not encapsulate the broader philosophy of continuous flow as Lean does. Similarly, the Agile methodology advocates for iterative and incremental development but isn't solely centered on achieving a continuous flow. The Program life-cycle model involves managing a collection of related projects and may not necessarily be aligned with the continuous flow aspect seen in Lean. Hence, Lean stands out as the most suitable choice when discussing a life-cycle model that prioritizes a continuous flow of work.