Revise From Evidence
Use evidence and design criteria to revise from evidence.
- Criteria and constraints: Design work needs success targets and limits before testing.
- Evidence-based iteration: Changes should trace to data, feedback, or a failed criterion.
Prerequisites are inferred: pending teacher review.
Re-learn the skill with worked practice and clear examples.
Pick the revision the failed-test evidence supports.
| Test | Result |
|---|---|
| Alarm volume | 75 dB, target met |
| Alarm timing | 14 s, target was under 10 s: FAILED |
| Battery life | 30 days, target met |
The evidence shows timing failed (14 s vs under 10 s) while volume and battery passed. Which revision does the EVIDENCE support?
Reviewed| Test | Result |
|---|---|
| Alarm volume | 75 dB, target met |
| Alarm timing | 14 s, target was under 10 s: FAILED |
| Battery life | 30 days, target met |
- A.Change the case color so the bottle is easier to spot
- B.Make the alarm louder than 75 dB so patients are sure to hear it
- C.Add more battery capacity so the alarm lasts longer
- D.Use a faster trigger circuit to cut the alarm time below 10 s
Show the worked solution ▾
Answer: D. Use a faster trigger circuit to cut the alarm time below 10 s
- Step 1: Use the failure: The only failed measure is timing (14 s, target under 10 s).
- Step 2: Match the fix: A faster trigger circuit attacks the timing problem; the other changes touch parts that already passed or were never tested.
Why it's right: Only the timing test failed, so the evidence supports a revision that makes the alarm faster.
- A: Color was never tested and is unrelated to the timing failure.
- B: Volume already met its target, so louder is not what the evidence calls for.
- C: Battery already passed, so more capacity does not fix the failure.
Aligned to Biotechnology Research and Experiments · reading level ~grade 9
The alarm sounds in 14 seconds and the target is under 10 seconds. By how much must the next version improve, at minimum?
Reviewed- A.By about 1 s, since the target is close to the measured time
- B.By more than 14 s, since the whole time has to go
- C.By 4 s, which lands the alarm right at 10 s
- D.By more than 4 s, since 14 minus 10 leaves exactly 4
Show the worked solution ▾
Answer: D. By more than 4 s, since 14 minus 10 leaves exactly 4
- Step 1: Find the gap: 14 minus 10 is 4 s.
- Step 2: Read the target wording: The target says under 10 s, so cutting exactly 4 s lands on 10 s and still fails.
Why it's right: Cutting 4 s brings the alarm to exactly 10 s, which does not meet a target of under 10 s. The improvement has to be larger than 4 s.
- A: The gap is 4 s, not about 1 s.
- B: The target is 10 s, not zero, so the whole 14 s does not need removing.
- C: Landing on 10 s fails a target that says under 10 s.
Aligned to Biotechnology Research and Experiments · reading level ~grade 9
- A student aims the redesign at the failed measure, not a passing one.
Fill these in as you work through the lesson.
- Test result (what a test measured):
- Target (value the test had to meet):
- Failed measure (the result that missed its target):
- Supported revision (a change the evidence backs):
Find the test, choose a revision that fixes that , and reject changes to parts that already .
- Which test failed?
- Which revision targets that failure?
- Which suggested change does the evidence NOT support?
Given volume passed, timing failed (14 s vs <10 s), battery passed: name the revision the evidence supports.