From Business Modeling to Use Case Diagrams: Vision, Business Cases, and System Design

Developers often struggle to distinguish between business use‑case diagrams and system use‑case diagrams; this guide starts by explaining how to define a clear vision, identify the target organization and its primary stakeholder, and set concrete improvement goals.

It then describes the creation of business use‑case diagrams, outlining the roles of business executors, business use‑cases, and business objects, and shows how to avoid common pitfalls when modeling business processes.

Next, the article introduces business sequence diagrams, illustrating how to map current workflows, identify improvement points, and avoid anti‑patterns such as over‑detail or irrelevant actors.

After establishing the business model, the guide moves to system design, explaining how to derive system use‑case diagrams from the business sequence, define system executors, and ensure functional interactions are correctly captured.

Finally, it covers use‑case specifications, detailing pre‑ and post‑conditions, stakeholder benefits, basic and alternative flows, and additional constraints, providing a complete method to translate business insights into precise software requirements.