This chapter discusses progress in the psychology of religion by highlighting its rapid growth during the past 25 years. Recent conceptual and empirical developments are described, with an emphasis on the cognitive and affective basis of religious experience within personality and social psychology. Religion and spirituality as domains of study, as well as being common and important process variables that touch a large portion of human experience, are highlighted. Movement away from the previously dominant measurement paradigm is noted, and particularly promising directions suggestive of an emerging interdisciplinary paradigm are described.

As part of the growing interest in quality of life and subjective well-being, the Spiritual Well-Being Scale was constructed to measure the spiritual dimension. Research has shown good reliability for the scale and has provided encouraging support for its validity. It indicates well-being in a variety of spheres, including physical and mental health, psychological adjustment, and assertiveness. However, no norms have been published and little descriptive data have been readily available for the scale. Test-retest and internal consistency reliability coefficients and descriptive data are presented for several religious, student, and client groups. In evangelical samples the typical individual gets the maximum score; thus, the scale is not useful in distinguishing among individuals for purposes such as selection of spiritual leaders. The scale is currently useful for research and as a global index of lack of well-being.

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The question of whether religious conversion causes changes in someone's personality is examined in light of two bodies of literature-the research on personality change and the research on conversion. When the theory and research on personality change is applied to the question of whether conversion causes such change, the answer depends on what level of personality is of concern. Research on the relation between religious conversion and a variety of behavioral, attitudinal, emotional, and lifestyle variables is consistent with this conclusion. Although conversion seems to have minimal effect on elemental functions such as the Big Five traits or temperaments, it can result in profound, life transforming changes in mid-level functions such as goals, feelings, attitudes, and behaviors, and in the more self-defining personality