How to Make Assembly Instructions Customers Can Actually Follow

Start with the parts and tools

Every good set of assembly instructions starts before step one. The builder needs to know what is in the box and what they will need that is not in the box.

Give every panel and every piece of hardware a short label, such as a letter for panels and a number for screws and dowels. Draw each item, show the quantity, and for hardware show it at true size so people can hold a screw against the page and check it. This one habit prevents many mix-ups, because many screws look alike until you compare their length.

Then list the tools. Say which ones are included and which ones are not. If a power drill is optional, say so. If it could strip a screw, say that too.

One action per step

The most common problem in assembly instructions is steps that ask for too much at once. A single drawing that attaches four panels, inserts twelve dowels and tightens eight cam locks is really five steps squeezed into one.

Break it up. A step should describe one action, or one small group of identical actions, such as inserting all the dowels into one panel. If you find yourself writing 'then' more than once in a step, split it.

Short steps feel slower on paper, but they are faster to follow. The builder spends less time checking and less time undoing mistakes. How instructions are drawn really does matter: in a Stanford study, people building a TV stand with redesigned step-by-step instructions finished 35% faster and made 50% fewer errors than with the factory instructions.

Show, don't write

Assembly instructions are read by people who speak many languages and who are often tired, standing, and holding a part in one hand. Words are a weak tool for them. Pictures carry the load.

Use drawings that show the part before it moves and where it ends up. Arrows show direction. A magnified circle shows small detail, such as which way a cam lock faces. Keep text for things a picture cannot say well, such as 'do not fully tighten yet'.

• Use the same viewing angle across steps when you can, so the builder is not re-orienting every page
• Shade or color the part that moves in this step so it stands out from parts already fitted
• Show the hardware used in the step in a small box in the corner, with its label and quantity
• Mark a correct and an incorrect version when a mistake is common

Orientation and scale cues

Many assembly errors are not about which part to use but which way round to use it. Panels with pre-drilled holes on one side, finished edges, or a groove for a back panel all have a right way up.

Point these features out. Show the finished edge facing the front. Show the holes facing inward. If two panels look nearly the same, label both clearly and show the small difference. Include a person or a hand in the drawing now and then, so the builder has a sense of size.

Warnings and safety

Put general safety information near the front: choking hazards for small parts, the need for two people on heavy steps, and any tip-over risk for tall furniture. Then repeat each warning at the step where it applies. A warning on page two does little good when the builder reaches the heavy lift on page nine.

Use one clear warning symbol and use it consistently. Do not bury safety notes in paragraphs of legal text.

Test with a first-time builder

The person who designed the product is the worst possible tester. They know how it goes together, so they read what they expect to see.

Hand a boxed product and the draft instructions to someone who has never seen it. Watch without helping. Note every pause, every wrong part picked up, and every step they read twice. Each of those is a place to fix. Repeat with a second person after the changes. Our assembly manual template guide includes a checklist you can use for this review, and our free manual health check at Manual health check flags common problems in a PDF.

Turn it into video

Once the paper instructions work, a video version is the natural next step. Motion answers the questions that still remain on paper: which direction something turns, how two parts slide together, and how far a bolt goes in.

Clear paper instructions also make a better video, because each clear step becomes a clear scene. That is how we work at Manual to Video. We take your finished PDF manual, animate each step in your brand, and review every film before delivery. If you would like to try it on your own product, upload a manual for a free watermarked preview.