Safety-relevant mode confusions—modelling and reducing them

Jan Bredereke, Axel Lankenau
<span title="">2005</span> <i title="Elsevier BV"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/rzixovqh2vd4vaspoqcbcb77hq" style="color: black;">Reliability Engineering &amp; System Safety</a> </i> &nbsp;
Mode confusions are a significant safety concern in safety-critical systems, for example in aircraft. A mode confusion occurs when the observed behaviour of a technical system is out of sync with the user's mental model of its behaviour. But the notion is described only informally in the literature. We present a rigorous way of modelling the user and the machine in a shared-control system. This enables us to propose precise definitions of "mode" and "mode confusion" for safety-critical systems.
more &raquo; ... We then validate these definitions against the informal notions in the literature. A new classification of mode confusions by cause leads to a number of design recommendations for shared-control systems. These help to avoid mode confusion problems. Our approach supports the automated detection of remaining mode confusion problems. We apply our approach practically to a wheelchair robot.
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