Writing clear and concise use case descriptions

A use case description explains how a person interacts with a product to achieve a specific outcome. It translates research and requirements into a practical scenario that designers, developers, testers and stakeholders can understand without guesswork.

Good use cases are brief, but they are not vague. They identify the user, the trigger, the expected result and the important steps between them. This makes them useful during discovery, interface design, usability testing and accessibility reviews.

For Australian teams, context can shape the scenario. A customer may be using a service on a mobile in a busy Melbourne tram, accessing it through the NBN from regional Queensland, or completing a government task during a short break in the arvo. These conditions affect device choice, connectivity, language and user expectations.

UCDmanager provides a shared space for recording user-centred design activities, including use case examples. A consistent format helps a project team compare scenarios and keep requirements connected to real user goals.

Start with the user’s goal

A strong use case begins with an outcome rather than a screen or feature. “Submit a Medicare claim” describes a user goal, while “click the green button” describes an interface action that may change during design. Goals remain valuable when the solution evolves.

State who wants to achieve the outcome and why. For example, “A customer checks whether a replacement debit card has been posted” is more informative than “The user views delivery information.” The first version gives the team a situation, a motivation and a clear result.

Keep the scope narrow enough to describe one meaningful interaction. Booking a GP appointment, changing an address and downloading a receipt may belong to separate use cases, even if they appear in the same service. Smaller scenarios are easier to review and test.

Use a simple, repeatable structure

A practical use case usually includes a name, primary actor, goal, trigger, preconditions, main flow, alternative flows and postcondition. You do not need lengthy prose for every field. A short, consistent record often exposes missing requirements faster than several pages of narrative.

Write the main flow as a sequence of observable actions and responses. “The customer enters the order number. The system retrieves the delivery status. The customer reviews the estimated arrival date” is clearer than “The customer tracks the order through the portal.”

Use present tense and active voice. Name the actor where responsibility matters, and name the system when it performs an action. This avoids unclear sentences such as “The details are then processed,” which leaves open who processes them and what processing involves.

Make actors and conditions explicit

Actors can be people, organisations or external systems. A use case might involve a policy holder, a support officer, an administrator and an identity provider. Distinguish the primary actor, who starts the scenario, from supporting actors that contribute information or services.

Personas can add useful context without making the use case bloated. For example, a persona representing an older customer in regional New South Wales may highlight low digital confidence, intermittent connectivity or a preference for plain language. UCDmanager’s persona workspace can help teams connect these characteristics to realistic scenarios.

Record conditions that materially affect the interaction. A customer might need a verified email address, an active account or a valid Australian postcode before proceeding. If the service must support screen readers, keyboard navigation or small mobile screens, include those expectations in the relevant requirements and acceptance criteria.

Avoid treating every possible problem as part of the main flow. Keep the normal path easy to scan, then document exceptions separately. A failed payment, expired session or unavailable postcode can be described as an alternative flow with a clear recovery outcome.

Remove ambiguity from every step

Concise writing depends on precise verbs and concrete outcomes. Replace “deal with the request” with “the service records the request and displays a reference number.” Remove filler such as “in order to,” repeated background information and details that do not change the interaction.

Watch for terms that mean different things to different teams. “Quickly” could mean two seconds to a developer and five minutes to a customer. Use measurable language where appropriate, such as “the confirmation page appears within three seconds under normal network conditions.”

A useful editing check is to ask whether each step answers who acts, what they do, what the system does and what happens next. Use this checklist when reviewing a scenario:

• Identify one primary actor and one measurable user goal.
• Replace interface-specific wording with outcome-focused language.
• Separate the standard path from errors and exceptional conditions.
• Define unfamiliar business terms, abbreviations and Australian regulatory references.
• Confirm that the final state is observable and testable.

Read the description aloud as if you were a customer. If a sentence sounds like internal jargon, rewrite it in everyday language. Australian users may say “postcode” rather than “ZIP code”, and a service intended for people across Perth, Hobart and remote communities should avoid assumptions about location, bandwidth or working hours.

Validate, test and maintain the scenario

A use case becomes more valuable when the team checks it against research and observed behaviour. Compare the scenario with interview findings, support records, analytics and usability testing. If customers regularly abandon an online application at identity verification, that issue should appear in the flow or an alternative path.

Use the description to create acceptance criteria and test tasks. A successful scenario might require the system to save progress, show a plain-language error and provide an accessible way to resume. These outcomes can then be checked by designers, testers and accessibility specialists rather than left as informal expectations.

Keep each record current as policies, integrations and interfaces change. A retail service that once relied on desktop checkout may now need to support mobile wallets, delivery addresses in outer suburbs and customers using slower regional connections. Reviewing use cases during sprint planning or service changes prevents outdated assumptions from spreading.

A clear use case also makes collaboration easier. Product owners can confirm the business outcome, developers can identify system behaviour, and researchers can test whether the scenario reflects real life. For an example of documenting a digital service context, review this project case study and note how user needs can be connected to functional requirements.