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The Anatomy of a Great Mobile Bug Report
Every field in a bug report exists to answer one question an engineer will ask before fixing it. Skip a field and you create a back-and-forth that delays the fix by hours or days.
Title
Tells triagers what they are looking at in two seconds. Format: "[Component] Action — what went wrong". Example: "[Checkout] Apply promo code — submit button does nothing on iOS".
Severity & Priority
Severity is technical impact (crash, data loss). Priority is business urgency (revenue blocking, edge case). Always set both — they tell different stories and route to different decisions.
Environment
Mobile bugs are platform-, device-, and version-specific. Capture platform, device model, OS version, app version, and network conditions. Without this, your report is unreproducible by anyone with a different setup.
Steps to Reproduce
Each step is a single concrete action. Start from a known clean state. Use exact UI labels in quotes. Note timing and data that matters. End with the buggy outcome.
Expected vs Actual
Expected describes the correct outcome with specifics. Actual describes the symptom verbatim — error text in quotes, what UI appears, what does not happen. "It does not work" is not an actual behavior.
Acceptance Criteria
Verifiable statements that confirm the fix. Cover the happy path AND at least one regression scenario. Without these, "fixed" can mean "the most obvious symptom is gone, but the underlying issue remains".
Severity vs Priority — A Decision Framework
Severity is what the bug does to the system. Priority is how soon the business needs it gone. They are independent — and confusing them costs sprints.
| Level | Severity (Technical) | Priority (Business) |
|---|---|---|
| Critical / P0 | App crashes, data loss, security exploit, payment failures | Stop the line. Hotfix today. Rollback if needed. |
| High / P1 | Core feature broken, blocks main user journey | Fix this sprint. Affects measurable share of users. |
| Medium / P2 | Secondary feature broken, has workaround | Schedule next sprint. Quality issue, not revenue blocker. |
| Low / P3 | Cosmetic glitch, edge case, rarely encountered | Backlog. Fix opportunistically when touching the area. |
A critical bug on a deprecated device used by 0.1% of users may legitimately be P3. A medium bug on the checkout flow may be the team's top P0. Always set both fields independently.
Common Bug Report Mistakes
Most slow-to-fix bugs are slow because of the report, not the code. Avoid these.
| Mistake | Impact | Fix |
|---|---|---|
| Vague title ("Login is broken") | Triagers cannot route or prioritize without reading the whole report | Use "[Component] Action — symptom". Always specific. |
| Missing environment block | Engineer cannot tell if bug is platform-specific or universal | Always capture platform, device, OS version, app version, network |
| "It does not work" actual behavior | No symptom to chase, debug, or verify against | Quote error text, describe what UI appears, what does not happen |
| No reproduction steps | Cannot reproduce → cannot fix. Often closed as "wontfix". | Numbered steps from clean state, with exact UI labels |
| No acceptance criteria | "Fixed" means most obvious symptom gone, root cause may remain | List 2-4 verifiable statements that confirm the fix |
| Conflating severity and priority | Engineering burns time on technically interesting but commercially trivial bugs | Always set both fields independently |