Applying the Extended Parallel Process Model to workplace safety messages

Area of Science:

• Health Communication
• Occupational Safety and Health
• Psychology

Background:

• The extended parallel process model (EPPM) is a key framework for understanding fear appeal effectiveness.
• EPPM posits that messages combining perceived threat and efficacy are most persuasive.
• The application and effectiveness of EPPM components in workplace safety contexts require further empirical investigation.

Purpose of the Study:

• To examine the utilization of EPPM factors in workplace safety communications.
• To experimentally test the effects of EPPM components, including potential multiplicative interactions.
• To validate findings across diverse English-speaking populations.

Main Methods:

• Study 1: Content analysis of existing workplace safety messages for EPPM factor presence.
• Study 2: Experimental study with 212 construction trainees evaluating message effectiveness.
• Study 3: Replication of Study 2 with 1,802 men across Australia, Canada, the UK, and the US.

Main Results:

• Workplace safety messages inconsistently incorporate all EPPM components.
• Self-efficacy is crucial for the effective deployment of threat in safety appeals.
• Maximum communication effectiveness is achieved when messages include severity, susceptibility, and efficacy (multiplicative effect).
• Findings were validated using graphic appeals across four countries.

Conclusions:

• Real-world workplace safety communications often fail to fully implement the EPPM.
• Integrating high levels of threat and efficacy significantly enhances message persuasiveness.
• The EPPM provides a robust framework for designing effective workplace safety interventions.