In this article we argue that the research on group recommender systems must look more carefully at group dynamics in decision making in order to produce technologies that will be truly beneficial for users. Hence, we illustrate a user study method aimed at observing and measuring the evolution of user preferences and actions in a tourism decision making task: finding a destination to visit. We discuss the benefits and caveats of such an observational study method and we present the implications that the derived data and findings may have on the design of interactive group recommender systems.

One of the most important health problems of today's society is hypokinesia accompanied by obesity. The assumption is that reduced physical activity has a large negative impact on the school population. The problem of reduced commitment and involvement of pupils in extracurricular activities is increasingly evident in recent times, which results in a number of negative health effects on the human body of an individual. This study comprised a group of older school children from first to fourth year of high school in Pale. The total sample consisted of 127 female pupils aged 15 to 18 years. As a way of gathering the required information we used an anonymous questionnaire of open type in order to collect information about student involvement in extracurricular sports activities. The survey was conducted in November 2012 and all the pupils voluntarily participated in the study. Based on the survey results have been obtained the necessary information to reflect the relative lack of physical activity, of the studied population. Of the total sample of female pupils, the survey confirmed that only about 22% are physically active pupils. The alarming are the results which showed that with the increasing age of pupils they are less physically active, and in the higher years is evident negative trend in physical activity (sports).