Chaos in the home is a key environment in cognitive and behavioural development. However, we show that children's experience of home chaos is partly genetically mediated. We assessed children's perceptions of household chaos at ages 9 and 12 in 2337 pairs of twins. Using child-specific reports allowed us to use structural equation modelling to…

The predominant theoretical orientation of the majority of scientists studying human behavioral development and family functioning is derived from systems models. These theories are dynamic in their conceptualization and emphasize process and context. To a large extent, the analytic strategies we employ are not consistent with our theoretical…

This paper examines whether a morally developed person is one who feels strongly about moral issues, or understands moral issues, or acts ethically when dealing with other people. It argues that the meaning of the term "moral" is concerned with how people ought to treat each other and that studies in morality should deal with the actions…

The present paper reports on results generated by an unconventional application of the testing paradigm. This application was made necessary by the nature of several goals of Project PLAN in the area of student personal and social behavior, self-planning skills for occupational and personal development, etc. Attainment of such goals is very…