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feedback of the test users and solved the various
problems, the app will be validated in a field test
with high-risk subjects, namely detoxified alcohol-
ics. In stressful situations, they are overwhelmed by
the urge to drink (craving) as a neurobiologically
triggered stress reaction that is beyond their con-
scious control (Sinha, 2013).
The impact will be measured in terms of the per-
ceived stress of the test persons. This will be meas-
ured with the German version of the Perceived
Stress Questionnaire (PSQ), which has been shown
to be a valid and economical tool for stress research
(Fliege et al., 2005). Usability of the app and user
satisfaction will also be measured, especially pa-
tients’ judgements of the every-day practicability
and convenience of the system and its perceived
effectiveness with regard to the prevention of crav-
ing and thus relapse (Clarke et al., 2010).
ACKNOWLEDGEMENTS
The work reported in this paper is funded by the
Swiss Confederation's innovation promotion agency
(CTI) under grant number 14049.2 PFES-ES.
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