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This article describes the use of personalized short text messages (SMS) to reduce snacking. First, we describe the development and validation (<i>N</i>&thinsp;=&thinsp;215) of a questionnaire to measure individual susceptibility to different social influence strategies. To evaluate the external validity of this Susceptibility to Persuasion Scale (STPS) we(More)
We often encounter situations in which an experimenter wants to find, by sequential experimentation, xmax = arg maxx f (x), where f (x) is a (possibly unknown) function of a well controllable variable x. Taking inspiration from physics and engineering, we have designed a new method to address this problem. In this paper, we first introduce the method in(More)
Persuasive technologies are growing in popularity and many designers create systems which intentionally change users attitudes or behaviors. This study shows that peoples individual differences in susceptibility to persuasion, as implemented using the six persuasion principles proposed by Cialdini [2], relates to their compliance to a persuasive request(More)
Likert-type scales are used extensively during usability evaluations, and more generally evaluations of interactive experiences, to obtain quantified data regarding attitudes, behaviors, and judgments of participants. Very often this data is analyzed using parametric statistics like the Student <i>t</i>-test or ANOVAs. These methods are chosen to ensure(More)
This paper examines the behavioral consequences of individual differences in persuadability in the health promotion domain. We use a 7-item persuadability instrument to determine participants per-suadability score. Based on this score two groups are created: the low and high persuadables. Subsequently, we present 2 studies that test the responses to(More)