Researchers are combining self-reports from mobile surveys with passive data collection using sensors and apps on smartphones increasingly more often. While smartphones are commonly used in some groups of individuals, smartphone penetration is significantly lower in other groups. In addition, different operating systems (OSs) limit how mobile data…

Considers the problems inherent in researching changes in social values and individual perspectives among selected age groups. Asserts that studies aimed at researching both aspects need to be organized as longitudinal studies. Utilizes data taken from a study of East and West Berlin adolescents to reveal specific research problems. (MJP)