App Feature Design and User Flows
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App feature design starts with a user task and the outcome it should deliver, followed by the steps, data and states needed to achieve it. Write acceptance criteria before implementation and test the complete flow rather than judging the feature by one screen.
Start with a user need and define the scope
Describe a specific situation in which someone needs the feature. In a team task app, an employee might need to assign work to another person and know whether that person accepted it. “Add intelligent collaboration” is too broad to describe the required behavior. State who starts, what they know beforehand and what they must know afterward. Identify the current problem: unclear ownership, a delayed response or an invisible change history. This prevents adding several controls without resolving the underlying task.
Choose a small part that can be tried independently. The first version might offer a person selector, an assignment request, a pending state and acceptance or rejection. A group conversation, rating system and calendar need not be included simply because they relate to collaboration. Explain how the feature interacts with existing behavior: does it immediately change ownership or create a proposal awaiting acceptance? Name current scope, later decisions and exception handling. You can use this brief with Infera Agent after checking project capabilities and identifying requirements needing additional setup.
- Name the user, situation and outcome.
- Identify one observable problem.
- Choose a small scope with clear boundaries.
Map the flow and its associated data
Write the user steps plainly: open the task, choose someone, review the choice, confirm the request and inspect the outcome. For each step, define input, output and information source. A person list needs a clear source and a stable identifier, rather than a name that might be shared by several people. Decide where the task and request are stored and who sees each item. A display step should not be described as a data change. This distinction helps implementers, reviewers and daily users understand the operation.
Define the state before and after each action. For assignment, distinguish a new proposal, acceptance, withdrawal and rejection, and specify when ownership actually changes. Interface text must not imply acceptance that has not happened. Explain how users revisit the task to inspect its state and what happens if the chosen person becomes unavailable or the task closes before a response. If a notification is involved, distinguish notification from saving the request; a saved request does not prove delivery. Describe a manual follow up when no tracking mechanism is implemented.
- Define input and output for every step.
- Use stable identities for related records.
- Distinguish saved state from messages.
Design ordinary and exceptional states
Present the information needed to decide: task name, current owner, selected person and consequences of confirmation close to the action. Use wording that describes the real operation, such as “Send assignment request” when acceptance is required. Do not announce assignment before it happens. Define what appears while waiting, when the list is empty or when required information is missing. Users should know whether they can proceed, whether they must change a choice and where to find the state after leaving. Review wording alongside layout instead of postponing it until the end.
Try cases that affect the decision: selecting the current owner, choosing someone unavailable, reviewing a task that has just closed or confirming repeatedly. Define the expected outcome before deciding the implementation. When an operation fails, preserve useful input and explain an available next step without claiming completion. Check small screens and long names, and make essential information understandable without relying on one color. If information changes during waiting, determine how the latest state appears and how users understand its difference from what they saw earlier.
- Label the actual operation.
- Define waiting, empty and failure states.
- Test changing data and repeated confirmation.
Write acceptance criteria and assess usefulness
Turn the flow into inspectable criteria: choosing an eligible person creates one request in the defined state; acceptance changes task ownership; rejection keeps the previous owner and shows the outcome; reopening displays the saved state. “The feature works” is not a useful substitute. Connect every criterion to a case, information and a result the reviewer can inspect. Try the sender and recipient accounts where that flow exists. Compare their views with the underlying records so two convincing screens cannot hide contradictory outcomes for the people involved.
Ask someone trying the task to explain what they understand before confirming and what they expect afterward. Observe where they stop, retry or ask who is responsible. Record feedback as specific behavior, then change what explains it. Repeat core cases and nearby affected paths after a correction. Save the brief, acceptance criteria and open decisions. Review real use before expanding the feature. Practical success means users complete their task and understand its outcome, rather than a screen containing many controls or looking complete in a single screenshot.
- Tie criteria to cases and outcomes.
- Check both parties and stored records.
- Review understanding before expanding.
Questions
Should I start with a screen or a problem?
Start with the user situation and required outcome, then define steps and information. The screen supports that flow and the decisions it contains.
How do I choose the first version?
Choose the smallest flow completing the essential task and allowing review. Explain its relationship to existing features and defer additions unnecessary for that flow.
What makes a good acceptance criterion?
It links a specific state, action and inspectable result, such as one saved request and ownership changing on acceptance. Avoid general statements without data or states.
When should I expand the feature?
After testing ordinary and exceptional cases and user understanding. Use observed behavior to choose the next addition instead of collecting unrelated possibilities.