Examples and Analogy
Examples and analogies are the workhorses of explanation. They turn an abstract mechanism into something the audience can see, hear or imagine. But a bad example confuses, and an analogy can mislead if its limits are hidden. This page shows how to choose both with care.
What an example does
| Function | What it adds | Example |
|---|---|---|
| Illustrates | Makes an abstract idea concrete. | “A packet is like a postcard with an address.” |
| Evidences | Shows that a claim is true in a specific case. | “In one Melbourne school, the program reduced food waste by a third.” |
| Contrasts | Shows what something is not. | “Unlike a bank transfer, a cryptocurrency payment has no central ledger.” |
| Humanises | Connects a system to lived experience. | “For the family waiting for the message, the delay was not a technical glitch.” |
| Tests | Shows where a rule does and does not hold. | “This works for small groups, but not at scale.” |
Ask what job the example is doing. If it is only there for decoration, cut it or replace it with one that carries explanatory weight.
Choosing an example
| Criterion | Question | Weak example | Stronger example |
|---|---|---|---|
| Relevance | Does it show the mechanism you are explaining? | A random fact about the topic. | A case that follows the same steps. |
| Specificity | Can the audience picture it? | “Many people ...” | “A Year 8 student in a school in Geelong ...” |
| Accuracy | Is it true and fairly described? | An invented or exaggerated anecdote. | A verified case with its context. |
| Representativeness | Is it typical, or clearly labelled as an exception? | One extreme case presented as the norm. | A typical case, plus a noted exception. |
| Length | Can it be told in a few sentences? | A five-minute story in a two-minute speech. | A compact case with one vivid detail. |
Analogy
An analogy compares an unfamiliar thing to a familiar one. It works by mapping relationships, not just appearances. “The heart is like a pump” works because both move fluid through a system under pressure. “The brain is like a computer” works for some processes and fails for others.
| Analogy | What it clarifies | Where it breaks |
|---|---|---|
| The internet is a postal system. | Packets, addresses and routing. | Postal workers do not choose the cheapest route in real time. |
| The immune system is an army. | Recognition, response and memory. | Armies have central command; immune systems are distributed. |
| Inflation is a balloon. | Prices rising and purchasing power shrinking. | Balloons do not have feedback loops or expectations. |
| A cell is a factory. | Specialised parts and energy use. | Factories are designed; cells evolved. |
Always say where the analogy stops. A sentence such as “Of course, the comparison is not perfect: unlike a factory, a cell has no manager” protects the audience from over-extending the image.
Definitions
A definition is a compact explanation. Use one when the audience needs a term before they can follow the mechanism. Good definitions are short, precise and, where possible, give an example.
| Term | Weak definition | Stronger definition |
|---|---|---|
| Algorithm | “A set of steps.” | “A finite sequence of instructions that produces a result, such as sorting a list from smallest to largest.” |
| Inflation | “Prices going up.” | “A sustained rise in the general price level, which reduces what a dollar can buy.” |
| Ecosystem | “Nature.” | “A community of living things and their physical environment, connected by flows of energy and matter.” |
Worked example: explaining a queue
Question: Why does adding one extra person to a queue slow everyone down so much?
Mechanism: Each person needs a turn, and the time per turn varies. When the queue is short, variation averages out. When it is long, a slow turn creates a backlog that takes time to clear.
Analogy: “It is like a single checkout at a supermarket. One customer with a full trolley can delay everyone behind them, and the delay does not disappear when they leave.”
Limit: “Real queues can open another checkout; a fixed server cannot.”
Example: “That is why a single delayed train during peak hour can affect services for an hour afterwards.”
This is an original teaching example, not a transcript of a real speech.
Activity: test three examples
- Choose a mechanism you want to explain.
- Write three possible examples.
- Score each for relevance, specificity, accuracy and length.
- Choose the strongest and explain why the others were weaker.
- Write one analogy and one sentence naming its limit.
- Read the example and analogy aloud to a partner. Ask what they now understand.
Common errors
- Example overload. Three examples of the same point become a list.
- Unexplained example. The audience enjoys the story but misses the link.
- Analogy as proof. A comparison illustrates; it does not establish a fact.
- Hiding the limits. Every analogy breaks somewhere; say where.
- Inventing detail. A vivid detail is not worth a false claim.
- Using the same example for everything. Variety helps different listeners.
Next, study jargon and plain language to make the wording as clear as the example. The visual aids and data page extends these choices to images and numbers.