Final answer:
Following the development of Booch diagrams, the usual next step is to develop a Unified Modeling Language (UML) diagram, specifically a use case diagram, to represent system interactions.
Step-by-step explanation:
After the development of Booch diagrams, the next step in a design process that involves iteration and refinement is not strictly sequential. However, within a traditional sequential model, Booch diagrams, which are a part of early object-oriented design methods, typically lead into more advanced modeling. Therefore, the next logical step often involves the use of the Unified Modeling Language (UML), which is an industry-standard way to visualize the design of a system.
UML encompasses a variety of diagram types, including use case diagrams. Still, if we must choose a single next step focusing specifically on system interactions, developing a use case diagram is a common practice. Use case diagrams are essential for understanding the functional requirements and interactions between users (actors) and the system.