Final answer:
The system's reaction to a business event generally leads to a 'use case', which outlines the system's processes and requirements in response to the event, thereby aiding in system modeling and design.
Step-by-step explanation:
The system's reaction to a business event usually leads to a 'use case'. A use case is a description of how users will perform tasks on your website, which is a part of system modeling used to specify and analyze system requirements. When a system needs to respond to a business event or a user action, that response is typically codified within use cases that depict interactions between users and the system.
Each use case focuses on describing the interaction to achieve a goal, capturing the system process required to respond to users or business events. Clear use cases are critical in the development of system requirements because they provide a framework for understanding the functionality and constraints of the system. Use cases also help in the engineering design process, ensuring that the system meets user needs and handles tasks efficiently.