What type of systems development is characterized by quickly building an experimental system for user review?

Prototyping is a systems development approach that focuses on creating a preliminary version of a system, referred to as a prototype. This prototype is built quickly and is an experimental model that allows users to interact with and evaluate the proposed system's functionality. The key purpose of prototyping is to gather user feedback early in the development process, enabling developers to understand the users’ needs better and make necessary adjustments based on that feedback.

This approach contrasts with more traditional methodologies like Waterfall, which follow a linear and sequential process where all requirements must be gathered before development begins. In the case of Incremental Development, the system is built and delivered in smaller segments, but it does not necessarily prioritize the rapid user review and feedback loop characteristic of prototyping. The Spiral Model incorporates iterative development and risk assessment but is more structured and may not yield a functioning prototype as quickly as prototyping does.

Prototyping allows for greater flexibility and responsiveness to user needs, enhancing user involvement and satisfaction in the system's final design.