What is a systems building approach that involves developing successive versions of a system?

The correct choice is iterative because this approach emphasizes developing a system through repeated cycles or iterations. In an iterative systems development process, each version of the system is built upon feedback and lessons learned from previous versions. This allows developers to refine features, improve user experience, and adjust system requirements as they progress through the development stages.

The iterative approach is particularly advantageous in situations where requirements may evolve or are not fully understood at the outset. It fosters a more flexible environment, enabling teams to respond to stakeholder input continuously and incorporate changes in a timely manner. Thus, the focus is on obtaining incremental improvements rather than trying to deliver a complete system in one go.

In contrast, end-user oriented approaches primarily involve users in the system's design and development phases but do not specifically highlight the successive versions methodology. Object-oriented focuses on structuring software design around data and objects, which is different from the iterative focus on ongoing development. Progressive may suggest gradual advancements but does not encapsulate the systematic iteration process. Therefore, iterative is the most accurate term to describe a systems building approach that involves developing successive versions of a system.