Abstract:The Functional Assessment of Chronic Illness Therapy-Spiritual Well-Being (FACIT-Sp-12) is a 12-item questionnaire that measures spiritual well-being in people with cancer and other chronic illnesses. Cancer patients, psychotherapists, and religious/spiritual experts provided input on the development of the items. It was validated with a large, ethnically diverse sample. It has been successfully used to assess spiritual well-being across a wide range of religious traditions, including those who identify themselves as "spiritual yet not religious." Part of the larger FACIT measurement system that assesses multidimensional health related quality of life (HRQOL), the FACIT-Sp-12 has been translated and linguistically validated in 15 languages and has been used in dozens of studies examining the relationships among spiritual well-being, health, and adjustment to illness.