Providing operators additional information helping them to validate alarms has been found to be acountermeasure for problems related to the cry wolf effect (i.e., operators ignoring alarms). Addinginformation can be realized with likelihood alarm systems (LAS) or with access to alarm validityinformation (AVI). The two studies presented here examined behavior and performance consequences ofthe combination of LAS and AVI in multi-task settings. It was investigated to what extent concurrent taskperformance and alert task performance depend on characteristics of the LAS (i.e. proportion of differentalert types) and cost of cross-checking AVI. Results suggest that those LAS characteristics varied here donot influence participants’ performance. Secondly, no benefit of LAS over binary alarm systems (BAS)emerged when increasing the cost of accessing AVI. Results are further discussed with regard toparticipants’ response patterns.
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