EN 894-1:1997+A1:2008

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Design principles for operator-task relationships
  4.1 Suitability for the task
      4.1.1 Principle of function allocation
      4.1.2 Principle of complexity
      4.1.3 Principle of grouping
      4.1.4 Principle of identification
      4.1.5 Principle of operational relationship
  4.2 Self-descriptiveness
      4.2.1 Principle of information availability
  4.3 Controllability
      4.3.1 Principle of redundancy
      4.3.2 Principle of accessibility
      4.3.3 Principle of movement space
  4.4 Conformity with user expectations
      4.4.1 Principle of compatibility with learning
      4.4.2 Principle of compatibility with practice
      4.4.3 Principle of consistency
  4.5 Error tolerance
      4.5.1 Principle of error correction
      4.5.2 Principle of error handling time
  4.6 Suitability for individualisation and learning
      4.6.1 Principle of flexibility
Annex A (informative) - Human information processing
Annex ZA (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 98/37/EC, amended by 98/79/EC
Annex ZB (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 2006/42/EC

This European Standard applies to the design of displays and control actuators on machinery. It specifies general principles for human interaction with displays and control actuators, to minimise operator errors and to ensure an efficient interaction between the operator and the equipment. It is particularly important to observe these principles when an operator error may lead to injury or damage to health.