FHTW - Fachhochschule für Technik und Wirtschaft, D-10313 Berlin
,, 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:
|• 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.
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.
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|
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-
|• 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|
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.