Warnings and Hazard Communications¶

Status: emerging
Last updated: 2026-05-31
Sources: 9781119636113.Ch24.Pdf
Tags: [warnings, hazard-communication, safety, c-hip-model, risk-perception, warning-design, compliance]

Summary¶

Warnings are safety communications that inform people about hazards and provide instructions to avoid or minimise undesirable consequences such as injury or death (Wogalter, Mayhorn & Laughery, 2021). Within the hierarchy of hazard control, warning is the third-preference measure, used only when a hazard cannot be designed out or guarded against. The chapter's central framework is the Communication-Human Information Processing (C-HIP) model, which traces a warning from its source through delivery, attention, comprehension, attitudes, motivation, and ultimately behaviour.

Body¶

Context¶

Wogalter, Mayhorn and Laughery (2021), in their handbook chapter on warnings and hazard communications, examine warnings as safety communications that inform people about hazards and provide instructions to avoid or minimise undesirable consequences such as injury or death. Their central framework is the Communication-Human Information Processing (C-HIP) model, which traces a warning from its source through delivery, attention, comprehension, attitudes, motivation, and behaviour. Within this knowledge base the article is the hazard-communication strand of safety design: its stage-by-stage information-processing account connects to the central-processing material in the cognitive cluster, its place in the hazard-control hierarchy links it to Human Error And Reliability and Accident And Incident Investigation, and as display content it relates to Representation Design and Website Design And Evaluation.

Key Points¶

Warnings serve safety goals at several levels, applied to both environmental and product-related hazards: improving safety by decreasing injurious incidents, influencing or modifying behaviour, and providing information that enables people to understand hazards, consequences, and appropriate behaviours (PDF p. 2, orig. p. 645). In the United States, interest in warnings is also tied to product-liability and personal-injury litigation, where warning adequacy is a prevalent issue (PDF p. 1, orig. p. 644).

Warnings occupy a defined place in hazard control. The hierarchy of hazard control prefers, first, to design the hazard out through alternative designs, then to guard against it if elimination is not possible, and only then to warn. This ordering establishes warnings as a last-resort control measure rather than a substitute for safer design or guarding (PDF p. 2, orig. p. 645).

The C-HIP model organises warning effectiveness as a sequence of stages: source, channel, and delivery on the communication side, followed by attention switch, attention maintenance, comprehension and memory, beliefs and attitudes, motivation, and behaviour on the receiver side. A warning can fail at any stage, so the model functions as a diagnostic tool for locating where a warning breaks down and where design effort should be directed (PDF pp. 4–14, orig. pp. 647–657).

Wogalter et al. acknowledge the limits of warnings: influencing behaviour reliably is difficult, and external and environmental factors also shape compliance (PDF p. 2, orig. p. 645).

Conclusion¶

Wogalter, Mayhorn and Laughery (2021) conclude that warnings are a last-resort measure within hazard control whose effectiveness must be diagnosed stage by stage through the C-HIP model. They look toward dynamic warnings that adapt to context and individually tailored warnings targeted to specific recipients, a move from static, one-size-fits-all warnings toward responsive hazard communication.

References¶

Wogalter, M.S., Mayhorn, C.B. & Laughery, K.R., Sr. (2021) 'Warnings and Hazard Communications', in Salvendy, G. & Karwowski, W. (eds.) Handbook of Human Factors and Ergonomics. 5th edn. Hoboken, NJ: John Wiley & Sons. wogalter2021warnings

Open Questions¶

At which C-HIP stage do warnings most often fail, and how should design priorities follow from that?
How effective are dynamic and individually tailored warnings compared with static warnings?