John Hay
John Hay Biomedical
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Principles of Biomedical Technology (Principles of Biomedical Science)
Unit 4: Unit 4.2 to 4.3 Innovation SynthesisPBS 4.2-4.3Biotechnology Research and Experiments

Revise From Evidence

Use evidence and design criteria to revise from evidence.

Builds on (2 levels back)inferred · high confidence
  • 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.

Step 1: Name the failure
Use the evidence table to name exactly what failed and by how much.
TestResult
Alarm volume75 dB, target met
Alarm timing14 s, target was under 10 s: FAILED
Battery life30 days, target met
Test evidence table listing what each test measured and the result.
Step 2: Match the revision
Choose the revision that targets the failed measure: not a part that already passed.
Practice

The evidence shows timing failed (14 s vs under 10 s) while volume and battery passed. Which revision does the EVIDENCE support?

Reviewed
TestResult
Alarm volume75 dB, target met
Alarm timing14 s, target was under 10 s: FAILED
Battery life30 days, target met
Test evidence table listing what each test measured and the result.
  1. A.Use a faster trigger circuit to cut the alarm time below 10 s
  2. B.Make the alarm louder than 75 dB
  3. C.Add more battery capacity
  4. D.Change the color of the case
Show the worked solution ▾

Answer: A. Use a faster trigger circuit to cut the alarm time below 10 s

  1. Step 1: Use the failure: The only failed measure is timing (14 s, target under 10 s).
  2. 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.

Why the others miss:
  • 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.
  • D: Color was never tested and is unrelated to the timing failure.

Aligned to Biotechnology Research and Experiments · reading level ~grade 9

Where you'd see this
  • A student aims the redesign at the failed measure, not a passing one.
Careers that use this
Biomedical Engineer: Targets the revision at the failed test result the evidence identifies.
Video library
Watch: Revise From Evidence
How to Write a Scientific Explanation Using Claim, Evidence, and Reasoning
adventures in ISTEM · 5:47
Guided notes

Fill these in as you work through the lesson.

Big idea: Revising from evidence means changing the part the test data says failed, and leaving parts that already passed alone.
Key terms: write the meaning
  • 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):  
The rule

Find the   test, choose a revision that fixes that  , and reject changes to parts that already  .

Check yourself
  1. Which test failed? 
  2. Which revision targets that failure? 
  3. Which suggested change does the evidence NOT support? 
Work one example

Given volume passed, timing failed (14 s vs <10 s), battery passed: name the revision the evidence supports.