Structure of an Explanation
An explanation is a guided tour. The audience needs to know where they are, why each stop matters and how it connects to the destination. This page sets out a reliable structure and the signposts that make it audible.
The explanatory frame
| Section | Job | Typical length |
|---|---|---|
| Orientation | Establish the question, context and key terms. | 15–20% |
| Mechanism | Explain how or why it works in two or three steps. | 50–60% |
| Example or demonstration | Make the mechanism concrete. | 15–20% |
| Close | Answer the question and consolidate the idea. | 10–15% |
For a two-minute explanation, that might be twenty seconds of orientation, seventy seconds of mechanism, twenty seconds of example and ten seconds of close. For a longer speech, add another mechanism step or a second example rather than padding the introduction.
Orientation
The first thirty seconds should do four things:
- Hook the audience with a concrete detail, question or surprise.
- State the question the speech will answer.
- Define the key term the audience needs.
- Preview the steps.
Model opening: “Every time you send a message, it is broken into pieces, sent along different paths and put back together. Most of the time, the pieces arrive in the right order. Today I want to explain how that happens, and what goes wrong when it does not.”
This is an original teaching example, not a transcript of a real speech.
Mechanism sections
Break the mechanism into two or three steps. Each step should answer a sub-question and connect to the next. Use a consistent pattern:
| Step | Pattern | Example |
|---|---|---|
| 1 | What happens first? | “The message is split into packets.” |
| 2 | What happens next? | “Each packet is addressed and sent independently.” |
| 3 | What is the result? | “The packets are reassembled at the destination.” |
If the mechanism is cyclical, say so: “The process then repeats.” If it has two parallel paths, signal the comparison: “There are two ways this can happen.” If it is contested, say that too: “Researchers disagree about which step matters most.”
Signposts for explanation
| Function | Phrases |
|---|---|
| Frame | “The question I want to answer is ...” “To understand this, we need to start with ...” |
| Sequence | “First ... next ... finally ...” “At the same time ...” |
| Cause | “Because of this ...” “This leads to ...” “As a result ...” |
| Contrast | “However ...” “On the other hand ...” “Not all cases work this way.” |
| Example | “Take the case of ...” “For instance ...” |
| Clarify | “In other words ...” “What I mean is ...” |
| Emphasis | “The key step is ...” “This is where it gets interesting.” |
| Close | “So, to answer the question ...” “That is why ...” |
Use signposts at the turns, not in every sentence. If the audience can hear the structure without noticing the labels, the signposting is working.
Explanatory patterns
| Pattern | Shape | Best for |
|---|---|---|
| Process | Step 1, step 2, step 3, result. | How something happens. |
| Cause and effect | Cause, mechanism, effect, qualification. | Why something happens. |
| Part and whole | Components, relationships, overall function. | How a system works. |
| Compare and contrast | Two cases, similarities, differences, conclusion. | Explaining by comparison. |
| Problem and solution | Problem, causes, possible responses, evaluation. | Explaining an issue and options. |
| Myth and correction | Common belief, evidence, better explanation. | Correcting a misconception. |
Choose one pattern and let it govern the body. A speech that moves from process to comparison to problem without signalling will feel disordered even if each section is clear.
Closes
A close should return to the opening question and give the audience a compact answer. It can also point to consequences or invite a question.
| Close | Example | Effect |
|---|---|---|
| Answer the question | “So the next time a message arrives, you will know it was not one journey but many.” | Consolidates the explanation. |
| Return to the image | “Remember the split message? It is reassembled before you ever see it.” | Creates a satisfying circle. |
| Consequence | “That is why a single lost packet rarely stops the message.” | Shows why the explanation matters. |
| Question | “What happens when the pieces arrive out of order?” | Invites further inquiry. |
Model skeleton
Question: Why does the moon appear to change shape?
Orientation: “Last night the moon looked like a thin curve. Next week it will look full. The moon has not changed shape.”
Step 1: The moon orbits Earth and is lit by the sun.
Step 2: We see different amounts of the lit half from Earth.
Step 3: The cycle takes about 29.5 days.
Example: Hold a ball under a lamp and turn around it.
Close: “The moon is always half lit. What changes is our view.”
This is an original teaching example, not a transcript of a real speech.
Activity: build the frame
- Write your explanatory question.
- Write one sentence for each of the three or four steps.
- Add a signpost to the start of each step.
- Write a concrete example or demonstration.
- Write a close that answers the question.
- Read the skeleton aloud in ninety seconds. Where does it need another step?
Structure is for the listener. A plan that makes sense on paper may still be invisible in speech. Say your signposts aloud and listen for whether they guide the ear.
Common errors
- Too many steps. Two or three are enough for a short explanation.
- No orientation. The audience does not know what question is being answered.
- Missing mechanism. The speech names a phenomenon but does not explain it.
- Example without connection. The audience enjoys it but cannot see the point.
- Weak close. The speech stops without answering the question.
- Over-signposting. Mechanical labels make the speech sound like a form.
Next, study examples and analogy to make the structure concrete. The jargon and plain language page makes the wording accessible.