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Abstract Activity recognition is important technology in pervasive computing which enables many critical human-centric applications Despite success in activity recognition research there seems to be a quest for a richer sentience that is more expressive than human activity In particular situation has received intense attention lately with a multitude of definitions motivated by a variety of goals With the goal of assessing user behavior response compliance in persuasive systems we propose a new definition of situation along with a framework for designing situation recognition algorithms Keywords Situation situation recognition user behavior persuasive systems1 IntroductionActivity recognition is an important technology in pervasive computing utilized in many different human-centered applications including surveillance systems 1 and healthcare monitoring systems 2 Depending on the type of sensors used to monitor activity activity recognition can be classified into two main approaches vision-based activity recognition 13 and sensor-based activity recognition 24 The most popular activity recognition algorithms are HMM Hidden Markov Model and CRF Conditional Random Field 56 Both HMM and CRF are used to find a sequence of hidden states based on observed sequential visual data or sequential sensor dataDespite success in activity recognition research there seems to be a quest for a richer sentience that is more expressive than activity In particular situation has received intense attention lately with a multitude of definitions motivated by a variety of goals For instance Chang 7 defined situation as a triplet of a users desire a set of the users actions and a set of contexts for service evolution in services computing Cho 8 defined situation as a temporal sequence of contexts for exception detection for safety in pervasive systems Kim 9 defined situation for assurance-oriented activity recognition as a set of activities and contextsThrough our recent work in persuasive systems 1011 in which we developed cybernetics to influence the user to change hisher behavior we realized the need for a specific definition of situation that involves contexts activities and
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