In one line
Before giving steps, good user instructions explain what the object or process is for, show a neat labelled diagram, and briefly describe each labelled part so the user can follow the steps.
Explained simply
If an instruction says 'Press the release lever', you need to know where the release lever is. A labelled diagram and a short parts description are the map that makes the steps usable.
Technically, the MU syllabus lists 'describing general function/purpose of an object/process', 'drawing labelled diagrams' and 'describing labelled parts' as components of writing user instructions. Together they form the introductory or descriptive section of a technical description.
How it works
- Title: name the object or process ('Using a Portable Fire Extinguisher').
- General function or purpose: one to three sentences on what it is, what it does and who uses it. 'A portable fire extinguisher is a hand-held cylinder that discharges an agent to put out small fires before they spread.'
- Labelled diagram: a simple, neat line drawing; label parts with straight leader lines (no crossing), labels outside the drawing, consistent names; add a figure title.
- Describe labelled parts: for each part, give name, location, appearance (shape, material, colour if useful) and function, in the same order as in the diagram (often top to bottom or outside to inside: spatial order).
- Use the same names for parts in the steps that follow.
Quick example
Parts description for a fire extinguisher: Handle: the fixed upper grip used to carry the cylinder. Operating lever: the movable top lever that releases the agent when squeezed. Safety pin: a metal pin with a tamper seal that locks the lever and prevents accidental discharge. Pressure gauge: a small dial showing whether the cylinder is charged (needle in the green zone). Hose and nozzle: direct the agent at the base of the fire. Cylinder: the red body holding the extinguishing agent under pressure.
Common mistakes
- Drawing a rough sketch without labels or a title, or labels with crossing lines.
- Describing parts in random order instead of following the diagram.
- Using one name for a part in the description and another in the steps.
How MU asks it
Usually part of a long question: 'Write user instructions for ... with a labelled diagram' (6 to 8 marks). Marks go separately for the purpose statement, the diagram, the parts description, steps and special notices. Practise simple objects: fire extinguisher, digital thermometer, induction cooktop, ATM use, laptop setup.