A software development manager wants to integrate a development model for a company that will allow them to release small blocks of well-tested code to bring functionality to the business as soon as possible. What is this method called?

The method being described is Agile, which emphasizes iterative development, where small increments of code can be developed and released quickly. This development model allows teams to respond flexibly to changing requirements and prioritize delivering working features early in the process. Agile methodologies, such as Scrum or Kanban, promote collaboration, customer feedback, and adaptive planning, making it suitable for environments where rapid changes and continuous improvements are critical.

In contrast, the Spiral model focuses on risk assessment through repeated iterations but is more complex and tends to be less about rapid delivery of small code blocks. The Waterfall model follows a linear sequential approach, where each phase must be completed before the next begins, leading to slower release cycles. While SecDevOps incorporates security into the DevOps process and emphasizes collaboration between software development and IT operations, it does not specifically address the rapid release of well-tested code in the way that Agile does. Thus, Agile is the most fitting choice for the scenario presented.