To script an educational video, build it in three acts: open on a puzzle the students cannot yet solve, explain the idea in small steps that each add to one picture, then return to the puzzle and solve it with what they just learned. Write every line for the ear, not the eye. One idea per sentence, sentences under about 20 words, the new term at the end of the sentence where it lands hardest, and the same name for each thing every time. Plan for about 150 spoken words a minute for older students and closer to 120 for younger ones or students learning in a second language. Then read it aloud and cut whatever you stumble on.

A lesson script is not a lesson plan read aloud

The usual first draft of an educational video is a set of notes turned into sentences. It reads well on paper. Spoken, it fails, for reasons that have nothing to do with the content.

A reader can reread. A listener cannot. A reader sees headings, bold terms and bullet points. A listener gets a single stream of sound with no formatting at all. A reader sets their own pace. A listener is carried along at yours.

So everything a page does with layout, a script has to do with words and structure. That is most of the craft, and it is why a script that sounds natural usually took more rewriting than one that reads well.

The three-act lesson

Most good lesson videos share one shape, whether or not the teacher thought of it this way.

The puzzle matters more than it looks. It turns the build from "here are some facts" into "here is how we figure this out", and the return gives students the small satisfaction of seeing it solved. That satisfaction is a large part of why they remember it.

If you want a fill-in version of this structure with word counts per part, use the educational video script template. The rest of this post is about how to write the lines.

Writing for the ear

These are the rules that change a script from something read into something heard. Each one has a before and after.

One idea per sentence. Before: "The Earth's axis, which is tilted at about 23.5 degrees relative to its orbit, means that the angle of sunlight changes over the year, causing seasons." After: "The Earth is tilted. It leans over by about 23 and a half degrees. Because of that lean, sunlight hits us at different angles through the year."

Put the new word at the end. Listeners remember what comes last in a sentence. Lead with what they know and end on what they are learning. Before: "Perihelion is when the Earth is closest to the Sun." After: "The point where the Earth comes closest to the Sun has a name. It's called perihelion."

Use the same name every time. In writing, we vary words to avoid repetition. In speech, a new word sounds like a new thing. If you say "the tilt" in one line and "the axial inclination" in the next, a twelve-year-old hears two ideas.

Say numbers the way people say them. "About 150 million kilometres", not "149.6 million kilometres". Keep the precise figure for a label on screen if it matters.

No brackets, no "respectively", no "the former". All three require the listener to hold something in memory and look back. They cannot look back.

Signpost out loud. "There are two reasons. The first is..." and later "The second reason is..." This is the spoken version of a numbered list, and it lets students know where they are.

Use contractions. "It's", "don't", "you'll". A script without them sounds read, because it is.

Pacing: how many words for how many minutes

These are planning figures, not rules. The bigger point is that the pace should drop where the content is hard. Slow down at the new term, leave a beat after a question, and speed up a little in the recap where the ideas are already familiar. In the script, you control this by sentence length: short sentences slow the listener down, slightly longer ones carry them through familiar ground.

Let the picture do half the work

The narration should not describe what is on screen. It should explain what the screen shows. "Here is a diagram of the Earth and the Sun" wastes a sentence. "Watch the Northern Hemisphere as the Earth moves round" tells students where to look.

Two research findings from Richard Mayer's work on multimedia learning are worth building into every script. People learn better from words spoken alongside pictures than from words printed alongside pictures, so keep on-screen text to short labels. And people learn better when the spoken word and the matching picture appear together rather than one after the other, so write the narration and the drawing as a pair, scene by scene.

In practice this means writing a short visual note next to every paragraph as you script. If you cannot say what is drawn while a paragraph is spoken, that paragraph is probably doing something a picture would do better, or it is filler.

Worked example: why we have seasons, in three acts

A script for lower secondary of about 340 words, which runs about two and a half minutes at 140 words a minute. Visual notes in brackets.

Act 1: the puzzle (about 60 words)

[The Earth's orbit drawn as a slightly squashed circle, the Sun near the middle.] "Most people think we have summer when the Earth is closest to the Sun. It makes sense. Closer to a fire, warmer. But here's the problem. The Earth is closest to the Sun in early January. That's the middle of winter in Britain. So if distance isn't the reason, what is? By the end of this video, you'll be able to explain it."

Act 2: the build (about 210 words)

[The Earth drawn with a line through it from pole to pole, leaning over.] "Start with this. The Earth spins around a line through the North and South Poles. We call that line the axis. And the axis isn't straight up. It leans over by about 23 and a half degrees. That lean is called the tilt."

[The Earth moves to the June side of the orbit; the top half leans towards the Sun.] "Now watch the tilt as the Earth goes round the Sun. The tilt always points the same way in space. So in June, the top half of the Earth leans towards the Sun. That's the Northern Hemisphere."

[Two torches drawn, one shining straight down in a small bright circle, one at a slant in a wide dim oval.] "Leaning towards the Sun does two things. First, the sunlight hits the ground more directly. Think of a torch. Shine it straight down and you get a small, bright circle. Shine it at a slant and the same light spreads into a wide, dim oval. Direct light heats the ground more."

[A clock face for London in June, the daylight portion large.] "Second, the days get longer. More hours of sunlight, fewer hours of dark, so more time to warm up."

[Pause card on screen, held for several seconds.] "Quick check. Pause the video. In June, what season is it in Australia? Then press play."

[The Earth moves to the December side; the top half now leans away.] "Six months later, in December, the Earth is on the other side of the Sun. The tilt still points the same way in space. So now the Northern Hemisphere leans away. Sunlight hits at a slant, and the days are short. That's winter."

Act 3: the return (about 70 words)

[The orbit again, both positions marked, the January position labelled closest.] "So, back to the puzzle. In June, the Northern Hemisphere is leaning towards the Sun, and that's summer. And Australia? It's leaning away. It's winter there. The tilt decides the seasons, not the distance. That's why the Earth can be closest to the Sun in the middle of a British winter. Now try this: explain to someone at home why Australians often have Christmas on the beach."

Look back at what the script does. The puzzle is a misconception most students hold, so the return overturns something they believed. The build adds to one drawing of the orbit. The term "tilt" is introduced at the end of a sentence and from then on it is always "the tilt", never "the angle" or "the inclination". And the check is placed so the return can answer it.

Make it

1. 1

   Write the puzzle and the answer first

   One familiar thing students cannot explain, and one sentence that explains it. If you cannot write the answer sentence, the topic is too big for one video.

2. 2

   Split the build into two to four steps

   Each step adds one thing to the same drawing. Write a visual note beside each paragraph as you go.

3. 3

   Rewrite for the ear

   One idea per sentence, the new word at the end, the same name every time, no brackets, contractions on.

4. 4

   Read it aloud with a timer

   Check the word count against the pace for your students and cut anything you stumble over. This pass usually removes a fifth of the script.

5. 5

   Turn it into a video

   Paste the script into openCanviz with Keep my wording on, so the narration is exactly what you rehearsed. Choose whiteboard style so the drawing builds with the words, then check every label.

6. 6

   Watch it once at full speed

   Note any scene where the drawing and the words do not arrive together, and fix that scene alone in the editor.

You can keep the generated voice or record the narration yourself. Students often listen more closely to a teacher they know, and you only need to re-record the scenes you change. See how to add voiceover to a whiteboard video.

Common questions

Should I write a full script or speak from notes? Write a full script for anything students will rewatch. Notes produce a looser, longer video with more filler, and every "um" and restart is replayed every time. A full script, read aloud a few times, will sound natural once you have rewritten it for the ear.

How is this different from scripting a training video? Training videos teach a procedure to adults who will do it at work, so they are built around steps and actions. Lesson videos teach a concept students need to understand and explain back, so they are built around a puzzle, a misconception and a check. See how to write a training video script for the workplace version.

How long should an educational video be? For a single concept, two to six minutes. If a script runs past about 900 words, it is usually two videos.

Can I use an AI to write the script? You can use one to draft, but the parts that make a lesson work (the puzzle, the misconception your students actually hold, the example from their lives) are the parts a generic draft misses. Write those yourself and check every fact and number.