To trace a production network, list each stage in order, write the place the source gives for it, and mark anything missing as “not stated”. The skill appears when a question gives a short text, a flow diagram or a map arrow chart and asks you to describe or explain a supply chain.
It extends classifying a stated activity by role, because each stage in the chain has a role. It belongs to the economic activities and resources module.
What does a production network contain?
A network is a chain, sometimes with branches. Typical stages are raw material, processing, manufacture, packing, transport, sale and design. Each stage has a role, a place and a link to the next stage.
The risk is that readers complete the picture from memory. A “reasonable” guess about where a factory stands is still an invention if the source does not say it.
How do you trace step by step?
- Underline every stage in the text, in the order the text gives it.
- Label each stage’s role (primary, secondary, tertiary or quaternary).
- Record the place the source states for the stage. If none is given, write “not stated”.
- Record the link, such as lorry, ship or pipeline, only if it is stated.
- Summarise the chain in one sentence and name the gaps separately.
Worked example
The firm and the text below are invented for this example.
“Latex is tapped from rubber trees on smallholdings in Region A. It is collected and processed into concentrated latex at a mill in Region A. The concentrate is shipped to a factory in Region B, where gloves are made. The gloves are packed and sold to hospitals through distributors.”
| Stage | Role | Place stated | Link stated |
|---|---|---|---|
| Tapping latex | Primary | Smallholdings, Region A | Collected |
| Processing to concentrate | Secondary | Mill, Region A | Shipped |
| Making gloves | Secondary | Factory, Region B | Not stated |
| Packing and selling | Tertiary | Not stated | Distributors |
Summary. “The network starts with primary latex tapping and first processing in Region A, then moves to glove manufacture in Region B. The text names distributors but not where packing happens or which hospitals buy the gloves.”
Gaps. The packing location, the route between Region B and the distributors, and the volumes are not stated, so they stay blank.
The traced chain contains four rows and three named places. Every entry can be pointed to in the text.
What is the mistake to watch for?
A typical slip is to complete the chain with confident details.
Mistaken answer: The gloves are packed in Region B by workers on the same site and flown to hospitals overseas.
The text says nothing about packing sites, air freight or overseas buyers. The correction is to remove each unsupported detail and replace it with “not stated” where the text is silent.
If the question asks you to suggest what is likely, present it as a suggestion and label it as such, for example “this is likely, but the text does not state it”.
Check yourself
1. A text says: “Cocoa beans grown in Region C are shipped to a chocolate factory in Region D.” State one fact you can write and one you cannot.
Show answer
You can write that cocoa is grown in Region C and that the factory is in Region D, with shipping as the link. You cannot write the type of ship, the distance, the volume or who owns the factory, because none is stated.
2. In the glove example, which stage is tertiary and why?
Show answer
Packing and selling through distributors. The role is a service that moves goods to buyers rather than extracting or manufacturing them. Packing could be read as part of manufacture, so the answer should state the reading used.
3. Why is “not stated” a useful entry rather than a weak one?
Show answer
It shows you separated evidence from assumption. An invented figure cannot be credited because it cannot be checked against the source.
Where does this lead next?
Continue to discussing a trade-off using explicitly supplied criteria, which uses the same discipline when you weigh choices. The food-web and energy-flow explorer shows another way to draw a chain as links between stages. Then try the mixed practice set.
Learning to stay inside the evidence helps in every data question, not only this topic. A teacher in online one-to-one Geography tuition can practise this with passages like the one above.