... Neither of the terms is novel as such and especially the latter has been used in various works throughout the history of psychology and philosophy (Brentano, 1874;Kant, 1781Kant, /1956Leibniz, 1704Leibniz, /1989Stout, 1896;Wundt, 1896Wundt, /1922. However, in order to appreciate their specific relevance and meaning in the context of the present thesis their understanding must be seen as derived from Saariluoma's recurrent discussions of a content-based approach within the science of psychology, and empirical implementations of related concepts (Helfenstein & Saariluoma, 2005;Saariluoma, 1990Saariluoma, , 1992Saariluoma, , 1995Saariluoma, , 1997Saariluoma, , 2001Saariluoma, , 2002Saariluoma, , 2003Saariluoma & Hohlfeld, 1994;Saariluoma & Kalakoski, 1997Saariluoma & Maarttola, 2003). Hence, the content-based approach to the study of psychological phenomena has so far been successfully applied to a variety of research questions surrounding human thinking and behaviour, and its merit has been demonstrated by the above mentioned researchers for the domains of design, architecture, chess playing, and engineering among others. ...