Which model of software development was developed by Winston W Royce?

Winston W. Royce is primarily known for introducing the Waterfall model of software development in his 1970 paper. This model is characterized by a linear and sequential approach, where each phase of the development process must be completed before moving on to the next. The phases typically include requirements analysis, design, implementation, testing, deployment, and maintenance.

The Waterfall model emphasizes thorough documentation and planning at each stage. This structured approach was influential in increasingly complex software projects, as it provided a clear framework for how development should proceed. It's particularly suitable for projects with well-understood requirements where changes are unlikely throughout the development process.

In comparison, Agile focuses on iterative development and flexibility, while the Spiral model combines iterative design with systematic risk analysis, and the Incremental model breaks the project into smaller segments that build upon one another. These models reflect different philosophies and strategies that evolved after the Waterfall model was established, highlighting the adaptability needed in an ever-changing software landscape.