Ryff's (1989b) Psychological Well-Being (PWB) scales measure six related constructs of human functioning. The present paper examined the validity of Ryff's 6-factor PWB model, using data from a life events study (N = 401) and an organisational climate study (N = 679). Previous validation studies, using Confirmatory Factor Analysis (CFA), have identified alternative PWB models, but limitations include the use of shorter scale versions with items relating to a number of life domains within the same PWB factor, and failure to examine the influence of participants' socio-demographic characteristics on PWB. In this study, Exploratory Factor Analysis (EFA) mostly found consistency in the PWB items and structure between the two studies whereby a 3-factor model delineated between items relating to Autonomy, Positive Relations and a superordinate factor comprising the other PWB factors. Using CFA, Goodness of Fit indices reached acceptable levels for the adjusted PWB model identified by the EFA, whilst differences between adjusted models of PWB previously identified in the literature were hardly evident. Post-hoc analysis by gender demonstrated socio-demographic effects on the structure and items that comprise PWB. Further development of PWB measures is needed to reflect its hierarchical and multi-dimensional nature. In the scales' current form, the construct validation of the PWB factors will continue to be problematic and will fail to adequately evaluate the nature and impact of PWB.Decades of research have related notions of positive mental and physical health with the absence of such adverse states as depression, anxiety, and physical illness. However, a number of 2 researchers have proposed that well-being is not necessarily the antithesis to these constructs of ill-being (Kahneman, 1999;Ryff, 1989a). A major challenge is to identify relevant dimensions of well-being and to understand how these dimensions are shaped by various human experiences.Ryan and Deci (2001) have described two distinct, yet related approaches with which most psychological theories of well-being could be aligned. The Hedonic, or Subjective WellBeing (SWB) approach, focused on immediate human functioning and experience, and was associated with perceptions of pleasure, displeasure, satisfaction, and happiness. With philosophical roots in antiquity and more recently in Priestley and Bentham's 'greatest happiness principle', models of SWB have perhaps been the most frequently reported on within the wellbeing literature (Diener, Suh, Lucas, & Smith, 1999). Alternatively, a Eudaimonic or Psychological Well-Being (PWB) model emphasises those mechanisms that are associated with healthy human functioning and adjustment. Whilst daily SWB fluctuates with life experiences (Headey 2000, Heady & Wearing, 1989, PWB is a relatively stable construct that captures those aspects of human functioning more likely to lead to adaptive human functioning and positive experiences (Ryan & Deci, 2001). Such theories are not new. As with SWB, PWB is grounded in an...