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What Makes a Good Use Case: Structure and Examples

A use case describes how a person or another system achieves a meaningful goal with a product. It turns broad requirements into a practical interaction story, showing what happens, who is involved and what the system must do in response. A well-written scenario gives designers, developers, testers and stakeholders a shared reference point.

For Australian organisations, this can make a major difference when designing services for varied audiences across Sydney, Melbourne, Brisbane and regional communities. A clear use case helps teams consider mobile access, intermittent connectivity, accessibility obligations and familiar local behaviours before those details become expensive changes.

What A Use Case Must Explain

A good use case focuses on a goal rather than a screen or feature. “Customer books an appointment” is useful because it describes an outcome. “Customer clicks the blue button” is too narrow and ties the requirement to an early interface decision.

Each scenario should identify the primary actor, the desired outcome, the system boundary and the trigger. It should then explain the normal flow, including the meaningful exchanges between the actor and the product. A supporting user roles activity can help a team distinguish customers, administrators, support staff and external services.

The description should answer practical questions: What starts the interaction? What information does the actor provide? What response does the system produce? What counts as success? These answers create a testable foundation for requirements and acceptance criteria.

Build A Reliable Structure

A consistent format makes use cases easier to compare and maintain. Useful fields include a short name, goal, actors, preconditions, trigger, main success scenario, alternative paths, exceptions and postconditions. The level of detail should match the risk and complexity of the feature.

The main flow can be written as numbered exchanges, although headings should remain descriptive rather than technical. For example, “The customer selects a delivery suburb” followed by “The system displays available delivery dates” is clearer than a list of database operations. A payment failure, unavailable appointment or incomplete form belongs in an alternative or exception flow.

Specific wording matters. If the scenario involves location, define whether the system uses a postcode, suburb, GPS signal or manually entered address. Even specialist systems need explicit assumptions; a technical product that points equipment in Australia may need to account for magnetic declination, rather than treating compass direction as universally fixed.

Keep Actors And Goals Precise

Actors are roles played in a situation, not necessarily named individuals. “Library member” is usually more reusable than “Sarah from Perth”. A primary actor starts the interaction, while secondary actors or integrated services support it. For a council booking service, these might include a resident, a payment gateway and a confirmation email service.

The goal should be valuable from the actor’s perspective and achievable within the use case boundary. “Manage the account” is often too broad, while “Reset a forgotten password using a verified email address” has a clear result. Splitting broad goals into smaller scenarios makes usability testing and defect analysis more manageable.

Use cases should also acknowledge differences in ability, device and context. A customer using a screen reader on a phone in Adelaide may follow the same goal as someone using a desktop computer in Canberra, but the interaction requirements will differ. Tools such as TubeTextify transcripts can support research teams when reviewing video-based user evidence and turning observed behaviour into realistic scenarios.

Examples From Australian Products

Consider an online grocery service. The primary actor is a shopper, the trigger is the decision to place an order, and the main flow includes selecting products, entering a delivery address, choosing a time slot, paying and receiving confirmation. Alternative flows cover substitutions, an unavailable delivery window, an invalid card and an item restricted by age.

An Australian public transport example might describe a commuter planning a journey from Footscray to the Melbourne CBD. The system should show route options, service disruptions, accessibility information and fare details. An exception could occur when a lift is unavailable, requiring the system to suggest a route with step-free access rather than simply reporting a generic error.

For a community event in regional Queensland, a use case could cover a participant purchasing tickets online. The scenario may include a mobile-first form, a low-bandwidth environment, accessible payment steps and an emailed ticket. A useful comparison is a tombola player scenario, where the participant’s goal, rules, selection process and outcome need to be clear before edge cases can be assessed.

Checks For A Strong Use Case

Review the scenario with people who understand the users, business rules and technical constraints. In UCDmanager, teams can organise personas, use cases, heuristic reviews and usability testing within a collaborative project, making it easier to connect a requirement with the evidence behind it.

Use the following quick checks before treating a scenario as ready:

A use case should evolve as research and design develop. Test it against prototypes with representative participants, including people who use assistive technology or have limited digital confidence. Findings from a usability session may reveal that a supposed exception is actually part of the normal flow.

A final review can focus on these questions:

When these checks pass, the use case becomes more than documentation. It becomes a durable link between user needs, product decisions and verifiable system behaviour.