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(a)software must be suitable for the task;

(b)software must be easy to use and, where appropriate, adaptable to the level of knowledge or experience of the operator or user; no quantitative or qualitative checking facility may be used without the knowledge of the operators or users;

(c)systems must provide feedback to operators or users on the performance of those systems;

(d)systems must display information in a format and at a pace which are adapted to operators or users;

(e)the principles of software ergonomics must be applied, in particular to human data processing.