ISO/TS 16976 provides information on factors related to human physiology, ergonomics and performance for the preparation of standards for performance requirements, testing and use of respiratory protective devices (RPD). This part of ISO/TS 16976 gives guidance on the generic ergonomic factors related to RPD. It specifies for the writers of RPD performance standards principles relating to: — the biomechanical interaction between RPD and the human body; — the interaction between RPD and the human senses: vision, hearing, smell, taste and skin contact. This part of ISO/TS 16976 does not cover requirements related to specific hazards for which RPD are designed.