Human-Computer Interaction: Ergonomics and User Interfaces - Vol. 1

By Hans-Jörg Bullinger; Jürgen Ziegler | Go to book overview

Test IT: ISONORM 9241/10

Jochen Prümper
FHTW - Fachhochschule für Technik und Wirtschaft, D-10313 Berlin
j.pruemper@fhtw-berlin.de


1
Introduction

,, ISO 9241: "Ergonoinic requirements for office work with visual display terminals (VDTs), Part 10: Dialogue Principles" ( 1995) is an official international standard and describes seven general ergononiic principles, which are independent of any specific dialogue technique; i.c. they are presented without reference to situations of use, applications, environments, or technology. The seven principles are as follows:


Table 1: The Dialog Principles of ISO 9241/10 (ISO 9241-10 1995, p. 5ff.)
Dialog Principle Description
• Suitability for the task A dialog is suitable for a task when it supports the user in the
effective and efficient completion of the task.
• Self-descriptiveness A dialog is self-descriptive when each dialog step is imme-
diately comprehensible through feedback from the system or
is explained to the user on request.
• Controllability A dialog is controllable when the user is able to initiate and
control the direction and pace of the interaction until the
point at which the goal has been met.
• Conformity with user
expectations
A dialog conforms with user expectations when it is consist-
ent and corresponds to the user characteristics, such as task
knowledge, education, experience, and to commonly accep-
ted coiiventions.
• Error tolerance A dialog is error tolerant if despite evident errors in input, the
intended result may be achieved with either no or minimal
corrective action by the user.
• Suitability for
individualization
A dialog is capable of individualization when the interface
software can be modified to suit the task needs, individual
preferences, and skills of the user.
• Suitability for learning A dialog is suitable for learning when it supports and guides
the user in learning to use the system.

-1028-

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