Which of the following is NOT a recognized software process model?

Continuous Integration is actually a development practice rather than a distinct software process model. It focuses on the frequent integration of code changes into a shared repository, where automated builds and tests occur, allowing for rapid feedback and detection of issues. Though it can be part of various software development processes, it is not classified as a standalone process model like the Waterfall, Incremental Development, and Integration and Configuration models.

In contrast, the Waterfall model is a linear and sequential approach to software development, widely recognized and followed, where each phase must be completed before the next begins. Incremental Development involves building software in small, manageable increments or sections, allowing for partial implementation and testing. Integration and Configuration, however, refers to strategies in software development that emphasize the integration of existing components and systems to build new solutions.

These recognized models provide frameworks and structured approaches to software development, which is why Continuous Integration stands out as not fitting into this category.