Final answer:
Rapid software updates, constant customer feedback, and simpler software changes are characteristic of the Agile process model, which allows for iterative development and quick adaptation. The related spiral model also involves iterative development but combines it with aspects of the traditional waterfall model.
Step-by-step explanation:
Rapid software updates, constant customer feedback, and simpler software changes are all characteristics of an Agile process model. This model is distinguished by its iterative approach, allowing for continuous integration and deployment of software, which enables quick incorporation of user feedback and adaptation to changes. The Agile model supports a collaborative environment where software development is conducted in short sprints, leading to incremental improvements. This contrasts with sequential or waterfall models, where each phase must be completed before the next one begins.
Another related concept is the spiral design process, which also involves iterative development. The spiral model combines iterative development with systematic, controlled aspects of the traditional waterfall model. Within the spiral model, software is developed in a series of incremental releases. During early iterations, prototypes are created, tested, and evaluated. These prototypes are then continuously refined through additional rounds of feedback and development.