There are two aims in this article, to define subjective quality of life and to suggest a way to standardize its measurement to enable comparisons to be made across studies. One of the unresolved issues in gerontological research has concerned the definition and measurement of quality of life (Lawton, 1991). This article focuses on subjective well-being, one of the four components proposed by Lawton (1991). There seems to be a growing consensus that most scales of well-being have at least two concepts in common, positive and negative affect. To test this hypothesis, two well-being scales, the Philadelphia Geriatric Center Morale Scale (Lawton, 1975) and the Center for Epidemiological Studies-Depression Scale (Radloff, 1977), were subjec ted to confirmatory factor analyses, using data on 1717 participants in the Australian Longitudinal Study of Ageing aged between 70 and 103 years. Each scale was shown to contain factors of positive and negative affect. The article concludes with a suggestion that the measurement of quality of life in elders should include, at a minimum, scales of positive and negative affect as well as other measures relevant to the aspect of quality of life under consideration.
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