In one line
Special notices alert users to information or hazards, and in increasing order of severity they are Note, Caution, Warning and Danger.
Explained simply
Think of traffic signals of risk. Note is a friendly tip (no danger), Caution is yellow (you might damage something or get a minor injury), Warning is orange (you could be seriously hurt), Danger is red (you will be seriously hurt or killed if you ignore it).
Technically, special notices are highlighted statements in instructions and on equipment. Their meanings follow widely used safety-labelling conventions (such as ANSI Z535 and ISO 3864 practice): Danger for hazards that will cause death or serious injury, Warning for hazards that could cause death or serious injury, Caution for hazards that could cause minor or moderate injury, and Note (ANSI: NOTICE) for helpful information or property/equipment damage with no injury risk. In everyday technical writing, “Caution” is also commonly used for equipment damage, as in the example below.
How it works
| Notice | Meaning | Example |
|---|---|---|
| NOTE | Extra information or tip; no hazard | 'Note: Charge the battery fully before first use.' |
| CAUTION | Risk of minor injury or damage to equipment or data | 'Caution: Do not unplug the drive during formatting; data may be lost.' |
| WARNING | Risk of serious injury or death if ignored | 'Warning: Disconnect the power supply before removing the cover.' |
| DANGER | Immediate hazard that will cause death or serious injury if not avoided | 'Danger: High voltage. Contact will cause severe injury or death.' |
- Place the notice immediately before the step it applies to.
- Make it visually distinct: capital heading, bold, box, or colour/symbol.
- State the hazard, its consequence and how to avoid it, briefly.
- Do not overuse notices, or users will start ignoring them.
Quick example
In instructions for cleaning a mixer grinder: 'NOTE: The jars are dishwasher-safe.' 'CAUTION: Do not immerse the motor base in water; it may damage the unit.' 'WARNING: Unplug the appliance before removing the blades; the blades are sharp and can cause serious cuts.'
Common mistakes
- Reversing Caution and Warning; Warning is more serious.
- Putting notices at the end of the instructions instead of before the relevant step.
- Using Note for a real hazard, which downplays the risk.
How MU asks it
Typical forms: 'Differentiate between Note, Caution, Warning and Danger with examples' (4 marks) or as part of a user-instructions question. Give the order of severity, a definition and one example each (a table is ideal), and state where notices are placed.