Quick summary: Vague warnings such as “be careful” can leave people unsure about what risk they face or how they should respond, while specific information supports better decisions. Clear risk communication should explain the concern, what is known, what remains uncertain and what action is appropriate. This approach can improve safety in workplaces, healthcare and everyday situations by helping people respond to risks without unnecessary alarm.
“Be careful” is one of the most familiar warnings we use. A parent says it before a child climbs something, a colleague says it when a task feels uncertain, and a manager might say it after a near miss. The phrase shows concern, but it leaves the person hearing it to work out what the concern actually means.
Careful about what? What could happen? How likely is it? What should I do differently?
Those questions matter because people do not perceive risk as a simple calculation of probability. Research by Paul Slovic showed that people judge hazards through qualities such as familiarity, controllability and severity, as well as probability. Two people can therefore receive the same information and come away with very different impressions of the same risk. When a warning is vague, there is little to resolve those differences.
A useful warning should help someone make a better decision. Baruch Fischhoff’s work on risk communication argues that effective communication should focus on the information people actually need, presented in a form they can understand and use. The point is not simply to express concern. It is to make that concern useful.
Consider a workplace example. “Be careful with that machine” tells an operator that someone thinks there is a problem, but it does not explain what the problem is or what should happen next. “The guard has failed to reset twice. Stop the machine if it happens again and call maintenance before restarting” gives the operator a specific condition and a clear response. There is much less left to interpret at the moment when a decision needs to be made.
The same principle applies in everyday situations. “Drive carefully” is well intentioned, but it does not tell the driver what has changed or what they should do. “The temperature is dropping below freezing and the bridge may ice first. Reduce your speed and leave more distance” provides information that can actually affect behaviour. The difference is not simply that the second warning contains more words. It contains information that can be acted upon.
Uncertainty needs to be communicated too
Uncertainty makes risk communication more difficult. People sometimes avoid precise warnings because they are not completely sure what will happen. They may soften the message, delay saying anything or use vague language because they do not want to be wrong.
But uncertainty is itself information. Research on communicating scientific uncertainty suggests that people need to understand what is known, what remains uncertain and how that uncertainty affects the decision they have to make. A useful warning can therefore acknowledge uncertainty without becoming useless: “I am not certain this will happen, but there is enough evidence to justify taking this precaution.”
That distinction is important because uncertainty does not necessarily mean that no action is required. In many situations, people have to make decisions without having complete information. The relevant question is what action is reasonable given what is currently known.
Risk communication is a skill
This is also why risk communication should be treated as a skill rather than a personality trait. People can learn how to communicate concerns more clearly, particularly when they understand what information someone needs in order to make a decision.
World Health Organization guidance on risk communication emphasises timely and understandable information, along with the actions people can take to protect themselves. Although the guidance concerns public health emergencies, the basic principle applies much more widely. Information becomes useful when it helps someone decide what to do.
Before giving a warning, it can help to consider four things: what exactly is the concern, what could happen if the concern is correct, what is known and what remains uncertain, and what action would be proportionate at that point.
The same questions can be useful when you are on the receiving end of a vague warning. If someone tells you to “be careful”, there is nothing wrong with asking what they are concerned about. Asking for the missing information is often more useful than trying to guess what the warning means.
Specific warnings also make it easier to learn
There is another advantage to being specific. Clear risk communication makes it easier to review what happened afterwards.
If a warning was simply that “something feels off”, it is difficult to assess later. Nobody can easily determine what the person noticed, what they thought might happen or why a particular response seemed appropriate. If the concern, uncertainty and proposed action were stated clearly, a team can later examine whether the judgement was accurate and whether the response was proportionate.
That matters in organisations where people need to report weak signals without turning every uncertainty into an alarm. A specific warning allows other people to assess the information rather than simply reacting to the emotional tone of the person delivering it.
Good risk communication does not eliminate uncertainty. It gives people enough information to make a sensible decision despite it.
So the next time “be careful” is about to leave your mouth, consider whether the other person will actually know what to do differently because you said it. If they will not, the warning probably needs a little more information.
Dr Dimitrios Chionis is a military psychologist and human factors specialist in the Hellenic Air Force. He works on risk perception, decision-making under pressure, and safety-critical systems.
