A useful solution fits the system around it: people, resources, decisions and unintended effects.
Your challenge
Choose a manageable school or community problem. Map its stakeholders and causes, then write a one-page problem brief with measurable success criteria.
LEARN & APPLY / 1
Separate a symptom from a cause
A symptom is what you notice. A cause is a possible explanation that needs evidence. A full rubbish bin might reflect collection timing, bin capacity or sorting behaviour. Avoid jumping straight to a favourite technology.
Try it yourself
List the symptom and three possible causes.
LEARN & APPLY / 2
Include missing perspectives
Ask who benefits, who does the work and who bears a cost. Discovery should be voluntary, respectful and supervised. Use a facilitator-provided scenario if field access is not available.
Try it yourself
Map at least four stakeholders and one potentially excluded perspective.
LEARN & APPLY / 3
Define success before building
A problem brief states who has the problem, the evidence, the constraints and what improvement would look like. A measurable criterion makes later testing possible.
Try it yourself
Write a brief and two success criteria with units or observable behaviours.
WHAT YOU WILL BE ABLE TO DO
Explain a causal chain and one feedback loop.
Identify an unintended cost and a measurable success criterion.
WORKED EXAMPLE
See the thinking.
Extra bins may reduce overflow but increase collection work. If staff cannot collect them, uncollected bins can worsen the original problem. 'Bins bought' measures an activity; 'overflow events per week' measures an outcome.
RETRIEVE. EXPLAIN. CHECK.
Who could bear a hidden cost in the extra-bin proposal?
Write your own answer before opening the explanation. Then improve one sentence using what you learned.
Compare your reasoning
Caretakers may need more time and equipment. Include their perspective and test collection capacity before deciding that more bins solve the problem.
Stretch yourself
Add one excluded stakeholder and test whether their needs change the success criteria. A supplied scenario is a complete alternative to field interviews.
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
Why more bins may not solve waste
50–60 minutes · Paper or browser · No purchase required
Builder
“Let’s buy more bins for the club space.”
Strategist
“Who empties them, where does the waste go, and what happens when collection stops?”
Illustrated learning characters. Scenarios and numbers are fictional; your human mentor reviews your evidence.
01 / PREDICT
Which could improve an outcome more: buying a bin or changing how it gets emptied? What would decide?
Write a prediction before you reveal the worked reasoning.
Draw the five actors and at least four arrows. Label each arrow with a mechanism, not just a line: e.g. missed pickup increases stored waste.
PRACTICAL STEP 2
Find a loop and burden
Trace a feedback loop, such as litter reducing care for the space and leading to more litter. Label this as a hypothesis to check. Identify whose work a proposed change increases.
PRACTICAL STEP 3
Choose a small test
Compare two interventions using the decision lab. Define an outcome measure, a baseline and a fair test period. Track overflow incidents, not only bins purchased.
TRY IT / NO ACCOUNT NEEDED
Make a choice you can explain.
The Strategist has three ideas for a fictional school club and a limited budget. Your job is to make a defensible choice, listen to other priorities and revise it when the constraint changes.
A score describes how well an option meets a criterion. A weight describes how important that criterion is. Multiply each score by its weight, then add. The table makes assumptions visible; the total is not proof that an option is best.
1. Choose your priorities
2. Challenge the scores
Fictional scores: 1 = weakest, 5 = strongest. High upkeep score means easier to maintain.
With the supplied scores, weights 3, 3, 2 give totals 29, 34, 27. Weights 1, 1, 5 give 27, 20, 22. The ranking flips because priorities changed; the options did not become objectively better or worse. If you edited scores, your results may differ.
3. Check what is affordable
Selected cost: 100 / 100 tokens. 0 tokens remain.
The table scores individual options; it does not optimise project bundles. At 100 tokens, reading + water fits. Water + science costs 110. At 80, no pair fits. Consider dependencies and overlapping benefits before combining projects.
4. Defend and test your decision
Who chose the weights? What supports the scores? Ask someone with a different priority to challenge your recommendation. Explain what you would stop, keep or redesign with 80 tokens.
Inputs reset when you leave. Download your reasoning or copy it to your private workbook.
A pickup rota could reduce overflow without more bins, but only if someone can perform the work. The Builder adds a collection-capacity assumption and checks with the caretaker before recommending a change. The causal map is a model to test, not proof.
Finding the answer is not evidence of mastery. Explain it, test a changed input and record your own work.
Your evidence checklist
Four arrows explain how one factor influences another.
My map includes a feedback loop and an overlooked burden.
My success measure records an outcome and baseline.
Independent challenge
Pickup becomes unavailable for a week. Adapt the intervention and explain its new limits.
Open the workbook template
Actor | Need | Influence | Burden
Arrow | Mechanism | Evidence or assumption
Feedback loop:
Option A / B:
Outcome measure | Baseline | Test period:
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 Why more bins may not solve waste 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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