NS EN 894-1 : 1997 + A1 2008

Introduction
1 Scope
2 Normative references
3 Definitions
    3.1 Control actuator
    3.2 Display
    3.3 Operator
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 individualization and learning
          4.6.1 Principle of flexibility
Annex A (informative) Human information processing
Annex ZA (informative) Relationship between this
European Standard and the EU Directive for Machinery

Describes 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.