The big idea: The triple bottom line is not only a scorecard. It is a way of prioritising the needs of clients, communities and the environment — and of discovering design opportunities where an account is being paid by somebody who was never asked.
Wherever one account is quietly subsidising the other two, there is a product waiting to be designed.
Step to the overlaps and then to the centre: the account that pays is where the opportunity is.
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Four steps from a conflict to a design opportunity
Find which account is paying
Every product that seems too cheap, too convenient or too profitable is being subsidised by one of the three. Name it.
Ask what it is paying FOR
Shipping water. A coating that fails at three years. A job removed. Once it is named as a cost, it becomes a target.
Change what the product IS
Optimising the existing product rarely moves an account by much. Selling the outcome instead of the object usually does.
Check the other two did not get worse
A refill that only works for users with good dexterity has moved the cost onto people. That is not a solution; it is a transfer.
| Account paying | What it pays for | The opportunity |
|---|---|---|
| Planet | Shipping water round the country in single-use bottles | A concentrate and a durable bottle, sold as a refill |
| Planet | A product scrapped for a worn part | A serviceable design, plus a spares and repair income stream |
| People | A tool nobody with weak grip can operate | One product that works for more users, with no special version |
| Profit | Warranty replacements and a reputation for disposability | Durability as the selling point rather than the cost |
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Sometimes no clever product removes the conflict, and a decision has to be made. The statement is about making that decision deliberately rather than by default.
An order you can defend
Safety and legality are not tradeable
Anything that harms a user or breaks a regulation is out before the balance is considered at all.
Then the account that cannot recover
A community losing a livelihood, or a habitat lost, cannot be bought back later. A margin can be rebuilt.
Then the whole-life view of profit
Many apparent conflicts disappear over ten years: durability that costs more per unit is cheaper per year of service to the buyer.
Say what you chose and what it cost
A recorded, reasoned compromise is the deliverable. A decision made by default, in a meeting about something else, is what causes the damage.
Beware the transfer: A great many "sustainable" decisions move a cost rather than remove it.
A thinner bottle moves cost to the user, who buys more. A refill moves effort to the household. Automation moves the cost from profit to people. Check all three accounts after the change, not only the one you were aiming at.
How this is tested — how the TBL helps prioritise needs and discover design opportunities. It comes up two ways:
Paper 1 — multiple choice
- Identify which account a decision shifts cost onto.
- Pick the design opportunity an imbalance reveals.
Paper 2 — analysing a product
- Explain how the TBL reveals an opportunity for a named product.
- Evaluate a decision, checking all three accounts after the change.
The trap: Announcing a sustainable decision without checking whether the cost simply moved. A thinner bottle, a refill and an automated line all move a cost onto a different account.
A power-tool manufacturer finds that most returned drills have a failed battery and a working motor. Explain how the triple bottom line turns this into a design opportunity.
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