Historically, depression researchers have examined continuity in terms of whether the symptoms and characteristics of mild, moderate, and severe depression differ in degree along a continuum (i.e., a quantitative difference) or in kind (i.e., qualitative difference). The authors propose a differentiated framework that distinguishes 4 direct tests of continuity (i.e., phenomenological, typological, etiological, and psychometric continuity). They use this framework to suggest that most evidence is consistent with the continuity hypothesis. Moreover, they maintain that the findings of future research can be incorporated into a 2-factor model of depression that allows for both continuities and discontinuities.

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User-Centered Design (UCD) is a multidisciplinary design approach based on the active involvement of users to improve the understanding of user and task requirements, and the iteration of design and evaluation. It is widely considered the key to product usefulness and usability---an effective approach to overcoming the limitations of traditional system-centered design. Much has been written in the research literature about UCD. As further proof of internationally endorsed best practice, UCD processes are also defined in ISO documents, including ISO 13407 and the associated technical report, ISO TR 18529. Increasingly, UCD has become part of the cultural vernacular of the executives and managers who drive technology development in companies of all sizes.

Much of the existing psychological literature on depression is based on research with college students. An important question is whether depression in college students represents an appropriate analogue of depression in clinical patients. The purpose of the present article is to review past evidence on this issue from a critical perspective. Past arguments are examined, and little support is found for the position that depression research with college students is not warranted. Moreover, the results of studies with student and clinical samples are compared, and the findings are generally similar across populations. Next, a number of methodological issues are identified that may actually favor the use of depressed college students, and some methodological recommendations for future research are outlined. Finally, an appeal is made for research that directly examines the analogue-clinical issue and the nature of college student depression.