What do you call a preliminary model of a software system that allows for evaluation of features?

A preliminary model of a software system designed to evaluate features is known as a prototype. Prototyping serves as an important step in the software development process, as it enables developers and stakeholders to visualize how the system will function and how users will interact with it. Through a prototype, features can be tested and feedback can be gathered early in the development cycle, which helps in making informed decisions and adjustments before moving on to more complex stages of development.

This approach allows for exploring design ideas, functionality, and user experience without fully committing resources to a complete software build. The iterative nature of prototypes fosters collaboration between users and developers, leading to improved design outcomes and a better fit for user requirements. Such an understanding of prototypes is crucial in practicing effective software design and development methodologies.