QC English: Writing Bug Reports, Test Cases & Review Comments That Actually Get Read

If you work in QA or testing and your team includes international colleagues, your written English becomes your daily tool. A vague bug report wastes hours. A poorly worded test case causes confusion. A blunt review comment damages relationships.

This guide gives you the exact phrases and templates Vietnamese QA engineers need to communicate clearly and professionally in English-speaking teams.

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The Most Common QC Scenarios

There are three situations where your English matters most:

1. Bug reports — describing what is broken and how to reproduce it
2. Test cases — writing clear acceptance criteria and steps
3. Review comments — giving and receiving feedback on test plans or code

Each has its own tone and structure. Let me break them down.

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Part 1: Writing Bug Reports

A good bug report answers five questions: What happened? What should have happened? How do I reproduce it? What is the environment? How bad is it?

Key Phrases for Bug Reports

Describing the issue:

• “The application throws an error when…”
• “The button fails to respond after…”
• “The page does not load as expected when…”
• “Users are unable to complete the checkout if…”
• “The system incorrectly displays the total when…”

Steps to reproduce:

• “To reproduce this issue, follow these steps:“
• “This bug occurs consistently when…”
• “The issue can be triggered by…”
• “Navigate to [page] → Click [element] → Observe [result]”

Expected vs actual:

• “Expected behavior: The form should submit and redirect to the confirmation page.”
• “Actual behavior: The form submits but shows a 500 error.”

Severity language:

• “This is a critical blocker — users cannot complete registration.”
• “This is a high-priority issue affecting the payment flow.”
• “This is a minor UI inconsistency that does not affect functionality.”
• “This is a low-priority cosmetic issue — spacing is off by a few pixels.”

Bug Report Template

Title: [Component] - [Short description of the problem]

Environment: Chrome 121 / Windows 11 / Staging

Severity: High

Steps to Reproduce:
1. Log in as a regular user
2. Add 3 items to the cart
3. Proceed to checkout
4. Select "Credit Card" as payment method
5. Click "Place Order"

Expected Result:
Order is placed and user is redirected to the confirmation page.

Actual Result:
A 500 Internal Server Error is displayed. Order is not placed.

Notes:
This does not occur when using "PayPal" as the payment method.
Attaching screenshot and console logs.

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Part 2: Writing Test Cases

Test cases need to be precise — another person must be able to run them without asking you questions.

Key Phrases for Test Cases

Writing preconditions:

• “Given the user is logged in as an admin…”
• “Assuming the feature flag is enabled…”
• “Prerequisites: User account must exist with at least one saved address.”

Describing test steps:

• “Verify that the system returns a 200 status code.”
• “Confirm that the email notification is sent within 30 seconds.”
• “Ensure the error message is displayed in red.”
• “Check that the total price reflects the applied discount.”

Writing acceptance criteria:

• “The system should allow users to reset their password via email.”
• “The feature is complete when users can upload files up to 10MB.”
• “This passes when the response time is under 2 seconds.”

Common Mistakes Vietnamese Speakers Make

Mistake 1: Too vague ❌ “The login not work.” ✅ “The login form does not submit when the password contains special characters.”

Mistake 2: Missing the expected result ❌ “Click the button and see what happens.” ✅ “Click the ‘Submit’ button. Expected: A success toast notification appears. Actual: Nothing happens.”

Mistake 3: Mixing present and past tense ❌ “The user clicked the button and the page not load.” ✅ “When the user clicks the button, the page does not load.” (use present tense for describing system behavior)

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Part 3: Review Comments

This is where many Vietnamese engineers struggle. Direct comments can sound rude in English, while overly polite comments can be ignored.

The Formula: Observation + Reason + Suggestion

Instead of just pointing out a problem, explain why it matters and what to do about it.

Key Phrases for Review Comments

Raising a concern:

• “I noticed that… — could we verify this handles the edge case where…?”
• “This test case seems to be missing a step for…”
• “It might be worth checking what happens when the session expires mid-flow.”

Suggesting improvements:

• “Consider adding a negative test case for invalid input here.”
• “Would it make sense to also test on mobile browsers?”
• “I’d recommend breaking this into two separate test cases for clarity.”

Asking for clarification:

• “Could you clarify what the expected behavior is when the field is empty?”
• “I’m not sure I follow the setup in step 3 — could you elaborate?”

Approving with notes:

• “Looks good overall! One small thing: the test description could be more specific.”
• “LGTM — just a minor suggestion on the severity labeling.”

Example Dialogue: Test Plan Review

Reviewer (you): “Hey Minh, I reviewed the test plan for the new filter feature. It covers the happy path really well. I did notice that there are no test cases for when a user applies multiple filters at the same time — could that combination cause unexpected results? I’d recommend adding 2-3 edge cases there before we sign off.”

Developer response: “Good catch! I’ll add those. Should I include a case where all filters are applied simultaneously?”

Your reply: “Yes, exactly. And if possible, also one where the filter results return zero items — we want to make sure the ‘No results found’ state is handled gracefully.”

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Quick Reference Card

Situation	Phrase
Severity: blocker	“This is a critical blocker — the feature is unusable.”
Reproducing	“This occurs consistently when…”
Expected vs actual	“Expected: … / Actual: …”
Suggesting in review	“Consider adding…” / “It might be worth…”
Asking in review	“Could you clarify…” / “I’m not sure I follow…”
Approving	“Looks good! One small thing…”

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Final Thoughts

QA English is not about perfect grammar. It is about clarity and precision. When you write a bug report, pretend the developer reading it has never seen the application before. When you write a review comment, imagine you are talking to someone face-to-face — friendly but direct.

Practice these patterns daily and your written communication will earn you the reputation of a clear, professional tester — no matter where your team is based.