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MISSION 11 / Engineering

Build a better version

Iteration is a reasoned change followed by another test.

Your challenge

Integrate your team’s work into a prototype or service model. Test it against the original criteria and document an improvement caused by evidence.

LEARN & APPLY / 1

Return to the criteria

Use the success criteria from the problem brief. A polished demonstration can distract from whether the solution actually works. Give each learner a specific test responsibility.

Try it yourself

Match each criterion to a test and a responsible team member.

LEARN & APPLY / 2

Invite useful feedback

Ask reviewers to attempt a task or challenge an assumption. Record what happened, not only whether they liked the result. Use supervised reviewers and avoid collecting unnecessary personal information.

Try it yourself

Run the test and log findings without changing the results.

LEARN & APPLY / 3

Show the difference

Change one important aspect and retest using a comparable method. Explain what improved, what did not and whether the original problem still needs a different solution.

Try it yourself

Document the before-and-after result and your own contribution.

WHAT YOU WILL BE ABLE TO DO
  • Link a design change to a failed requirement and a comparable retest.
  • Write handover instructions another learner can use.
WORKED EXAMPLE

See the thinking.

An alert misses 4 of 15 prepared trials. After a justified revision it misses 1 of 15 new comparable trials. That is promising but limited evidence, not universal reliability. Record requirement, test, result, change and retest.

RETRIEVE. EXPLAIN. CHECK.

Why is a new feature alone not evidence of improvement?

Write your own answer before opening the explanation. Then improve one sentence using what you learned.

Compare your reasoning

Improvement needs a relevant criterion, a reason for the change and a fair retest. A feature can add complexity or fail to address the original problem.

Stretch yourself

Ask another learner to follow your setup instructions without verbal help. Record where they become stuck and revise the handover.

Build it. Try it. Change one thing.What would you test when the easy example works?Illustrated learning characters · fictional scene
TEN-MINUTE FIRST TRY

Try before you read the solution.

The Inventor's first prototype takes six steps; the new one takes four. Design one comparable test before claiming improvement.

Scratch space: not saved. Copy useful reasoning into your private workbook.

Short lessons for this project

One project, growing across missions

Choose a fictional club service, a water-data investigation, or an accessible information tool as your capstone. Keep the same problem brief through your budget, prototype, tests, revision and final defence. The crew exercises teach a method; apply that method to your chosen project and explain any adaptation. Simulation is a complete route.

THE CREW AT WORK / GUIDED PRACTICAL

Improve a failure, then hand it over

75–120 minutes · Paper or browser · No purchase required

Researcher

“Two of our five tests failed in version one.”

Builder

“I was going to add a feature. Let’s fix one failure and rerun the same tests first.”

Illustrated learning characters. Scenarios and numbers are fictional; your human mentor reviews your evidence.
01 / PREDICT

If you change three things and the result improves, which change caused it?

Write a prediction before you reveal the worked reasoning.

Your starter material

Use any earlier artifact. Fictional example: calculator v1 handles 3 and 0 units but accepts blank as zero and −2 as a negative total. Start a version log and keep v1 intact.

PRACTICAL STEP 1

Make failure reproducible

Give each requirement and test an ID. Record input, expected output, actual output and version. Ask another person to reproduce one failure from your instructions.

PRACTICAL STEP 2

Change and compare

Make one purposeful change, such as blank-input validation. Rerun the original tests plus a new boundary case. Report regressions as well as improvements.

PRACTICAL STEP 3

Hand over

Write setup, use, test and limitation notes. A supervised fresh reviewer or role-play follows them without verbal rescue. Record where the notes were insufficient and revise them.

Compare with the crew’s reasoning

Builder v2 fixes blank input but still accepts −2. The honest report is one failure fixed and one remaining, not ‘all done’. After v3 rejects negatives, the old valid cases must still pass. This is regression testing.

Finding the answer is not evidence of mastery. Explain it, test a changed input and record your own work.

Your evidence checklist

  • The old and new versions can be compared.
  • A change is linked to a repeatable test.
  • Handover notes include setup and remaining limitations.

Independent challenge

The next person has no internet. Adapt the artifact or instructions and test that route.

Open the workbook template
Requirement | Test ID | Version | Expected | Actual | Pass/fail
Suspected cause:
One change:
Regression result:
Fresh-user handover observation:
Remaining limits:
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A DIFFERENT WAY TO TRY IT

Make the idea your own.

Choose a twist. Use paper, a sketch or a conversation.

Optional practice. Copy useful observations into your workbook; choosing a twist does not record completion.

Compare ideas with someone you know. Sharing is optional.

Need a hint or a clearer next step?

Work through Improve a failure, then hand it over with a focused prompt. Your notes stay private unless you choose to paste an excerpt here.

Use fictional examples. Leave out names, contact details, passwords and private records.

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