Sprint planning meetings are where projects succeed or fail. As a Vietnamese tech lead in an international team, you need to do more than just raise a number on your fingers — you need to defend your estimates, push back on unrealistic timelines, and guide the team toward a healthy sprint. And you need to do it all in English, clearly and confidently.
This guide gives you the exact language to run or participate in sprint planning like a senior engineer.
Why Estimation Talks Are Hard in English
Estimation is not just math — it’s negotiation, risk communication, and team alignment. In Vietnamese, you might say things casually and rely on context. In English, especially with international stakeholders, ambiguity kills sprints.
Common problems Vietnamese devs face:
- Saying “I think maybe 3 days” — sounds uncertain, invites pressure
- Saying “No problem” when there clearly is a problem
- Going silent when you disagree with a PM’s estimate
- Using points and days interchangeably without clarifying
The fix: learn the frames native speakers use to communicate estimates with confidence.
🗣️ Key Phrases to Say Out Loud
Practice these until they feel automatic. Say each one aloud 3 times.
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“I’d estimate this at 8 points — here’s my reasoning.” /aɪd ˈɛstɪmeɪt ðɪs æt eɪt pɔɪnts — hɪərz maɪ ˈriːzənɪŋ/
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“There’s a hidden dependency we haven’t accounted for.” /ðɛrz ə ˈhɪdən dɪˈpɛndənsi wiː hævnt əˈkaʊntɪd fɔːr/
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“I want to flag this as a risk before we commit.” /aɪ wɒnt tə flæɡ ðɪs æz ə rɪsk bɪˈfɔːr wiː kəˈmɪt/
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“Can we timebox the investigation to two days and revisit?” /kæn wiː ˈtaɪmbɒks ðə ɪnvɛstɪˈɡeɪʃən tə tuː deɪz ænd rɪˈvɪzɪt/
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“That estimate assumes everything goes smoothly — it rarely does.” /ðæt ˈɛstɪmɪt əˈsjuːmz ˈɛvrɪθɪŋ ɡoʊz ˈsmuːðli — ɪt ˈreɪrli dʌz/
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“I’d like to split this story — it’s too broad to estimate accurately.” /aɪd laɪk tə splɪt ðɪs ˈstɔːri — ɪts tuː brɔːd tə ˈɛstɪmeɪt ˈækjərɪtli/
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“We’re carrying over two tickets from last sprint — that affects our velocity.” /wɪər ˈkæriɪŋ ˈoʊvər tuː ˈtɪkɪts frɒm læst sprɪnt — ðæt əˈfɛkts aʊər vɪˈlɒsɪti/
📚 Vocabulary
1. Velocity /vɪˈlɒsɪti/ The average number of story points a team completes per sprint. “Our velocity has dropped to 32 points — we over-committed last sprint.”
2. Timebox /ˈtaɪmbɒks/ A fixed period of time allocated for an activity, after which you stop regardless of outcome. “Let’s timebox this discussion to 15 minutes.”
3. Scope creep /skoʊp kriːp/ The gradual expansion of project requirements beyond original boundaries. “We need to push back — this is scope creep disguised as a small ask.”
4. Carry over /ˈkæri ˈoʊvər/ To move an unfinished ticket from one sprint to the next. “We’re carrying over three stories — I want to understand why before we plan more.”
5. Spike /spaɪk/ A short, timeboxed investigation task used to reduce uncertainty before estimation. “We don’t have enough information to estimate this — let’s add a spike first.”
6. Definition of Done /ˌdɛfɪˈnɪʃən əv dʌn/ The agreed criteria a story must meet to be considered complete. “Does our DoD include code review and QA sign-off? Because that adds time.”
7. Buffer /ˈbʌfər/ Extra time or capacity reserved for unexpected work. “I always keep a 20% buffer for bugs and review cycles.”
🎯 Practice Now
Scenario 1: Defending Your Estimate
The PM says: “This looks like a 3-point story. Why did you estimate 8?”
Your response (practice saying it aloud):
“I appreciate you asking. On the surface it looks simple, but there are a few things adding complexity. First, this touches the payment service, which has strict testing requirements. Second, we don’t have existing tests for this flow, so we need to write them from scratch. And third, we need a security review before deploying to production. When I account for all of that, 8 points is actually conservative.”
Scenario 2: Pushing Back on Overcommitment
The PM wants to add more stories after the sprint is already full.
“I want to be transparent with you. We’re already at 38 points, and our average velocity is 32. If we add this story, something else won’t get done. I’d rather be honest now than miss our commitment at the end of the sprint. Can we put it in the backlog and prioritize it for next sprint?”
Scenario 3: Asking for a Spike
The team gets a vague story about integrating with a third-party API.
“I’m not comfortable estimating this yet. We haven’t looked at their API documentation, and we don’t know if there are rate limits or authentication complexities. Can we add a spike — maybe 2 points — to investigate first? Then we can estimate the actual implementation in the next sprint.”
⚡ Real Patterns from Sprint Planning Rooms
Here are conversation templates that experienced tech leads use to control planning discussions:
Opening the estimation discussion:
“Before we vote, does everyone understand the acceptance criteria? I want to make sure we’re estimating the same thing.”
When estimates vary widely:
“We’ve got a wide spread — 2 points to 13 points. Let’s hear from the 13 first. What are you seeing that others might have missed?”
Closing a debate professionally:
“We’ve been discussing this for a while. Let me summarize: the main risks are X and Y. I’m comfortable at 8 points with those risks documented. Can we move forward?”
After a difficult sprint:
“Before we plan, I want to do a quick retro on last sprint’s estimation. We were 40% over. I think we need to account for integration testing time — it consistently takes longer than we plan.”
🔑 The Mindset Shift
Many Vietnamese developers feel uncomfortable challenging estimates from PMs or senior stakeholders. In international teams, this is not just acceptable — it’s expected. Being silent is read as agreement.
The key phrase to internalize: “I want to flag this as a risk before we commit.”
This phrase is professional, not aggressive. It says: I respect the deadline, AND I want us to succeed, so I’m telling you what I see. That’s what senior engineers do. That’s what tech leads do.
Sprint planning is your moment to protect your team. Use your English skills to do it well.