In designing, selecting, commissioning and modifying software, and in designing tasks using display screen equipment, the employer shall take into account the following principles:
(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.