How many units can receive the full test?
Bramble Devices plans to test 120 units of one new revision in a shift.
The question
Each station completes a whole test on one unit at a time. The two stations can work independently. No operator or shared-resource limit affects this case.
| Amount | |
|---|---|
| Independent stations | 2 |
| Usable minutes per station | 420 |
| Approved base test minutes per unit | 6 |
| Target units | 120 |
The proposed schedule also mentions a repeat measurement. Check its approved frequency before you book it.
“Tell the test lead whether the target fits without omitting a required check.”
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A strong answer, step by step
Open each step in turn. This is one strong answer, not the only one.
Step 1: What is the base capacity?
What would you do here? Open the move you’d make.
Plan for 70 units because each test uses one station
Tempting, but it misses something. Both stations can work at the same time.
Plan for up to 140 base tests across the two stations
The strong move. Each station can complete 420 divided by 6, or 70.
Promise 140 for the final plan
Tempting, but it misses something. The capacity still depends on the approved repeat requirement.
See how a strong candidate says it
“Each station can complete 70 tests, for 140 in total. Testing 120 units takes 720 of the 840 available station-minutes, leaving 120 with a balanced load.”
Why it works: Capacity is a count of whole units. The sum of station-minutes gives the workload margin.
Step 2: Can you commit to the AI draft?
The AI-drafted workbook reserves 1.5 extra station-minutes for one in ten units. It does not cite an approved repeat frequency.
What would you do here? Open the move you’d make.
Book the draft as final because 738 is less than 840
Tempting, but it misses something. Capacity alone does not establish the required coverage.
Use 738 as a conditional estimate and verify the test revision
The strong move. This gives the test lead an estimate and the condition it depends on.
Ignore the extra measurement because the base plan fits
Tempting, but it misses something. The test revision can add time to every completed unit.
See how a strong candidate says it
“If one-in-ten sampling were allowed, 12 repeats would add 18 minutes and bring the workload to 738 station-minutes. That fits. I would check the approved repeat frequency before I commit.”
Why it works: The workbook provides a scheduling assumption. It gives no approval to sample.
Step 3: What is the full-test capacity now?
The signed test change requires the 1.5-minute repeat on every unit in this revision, on the same station before the unit counts as complete.
What would you do here? Open the move you’d make.
Keep the sample plan to preserve the target
Tempting, but it misses something. The signed revision requires the repeat on every unit.
Count the 6-minute test as complete and schedule the repeat later
Tempting, but it misses something. The case counts a unit only after the repeat on the same station.
Plan for 112 full tests and ask for the 60-minute gap
The strong move. This preserves every required check and gives the schedule owner a measurable choice.
See how a strong candidate says it
“Every unit takes 7.5 minutes. Each station can complete 56, so the two stations complete 112. We are 8 units short of 120, which needs 60 more usable station-minutes.”
Why it works: The approved requirement applies to every unit in this revision. The sample-based draft leaves required work out.
Step 4: What plan do you give the test lead?
What would you do here? Open the move you’d make.
Ask for more usable station time or split the work into two windows
The strong move. The lead gets two schedules that retain the full approved test.
Make up the time by letting both stations skip four repeats
Tempting, but it misses something. Skipping checks changes the approved per-unit requirement.
Count 120 units as complete if the last eight have started
Tempting, but it misses something. Started units have not finished the required test.
See how a strong candidate says it
“I would ask for 30 more usable minutes on each station to complete 60 units per station. If that time is unavailable, I would schedule 112 this shift and eight in a second window.”
Why it works: The 120 full tests use 900 station-minutes. Either schedule accounts for all required work.
The answer, in short
- Decision
- Retain the per-unit repeat and plan 112 complete tests in the original window.
- Because
- The target needs 900 station-minutes. The two stations have 840 usable minutes.
- What would change it
- An extra 30 minutes on each station would support 120 complete tests in the extended window.
Common traps
- Check which units need a repeated measurement.
- Count only whole tests completed at a station.
Check your answer
- I calculated base capacity.
- I checked the draft assumption.
- I used the approved repeat requirement.
- I offered two complete schedules.
Last reviewed Nov 11, 2026