Attempts at defining spirituality vacillate between the human and the divine. However, many studies show relationships between spirituality or religion and health. An extensive literature search and a study of almost 100 educators in four different types of schools led to a model in which spiritual health is understood to be a, if not the, fundamental dimension of health, permeating and integrating the other dimensions of health (physical, mental, emotional, social, and vocational). The quality of relationships experienced between each person and themselves, others, the environment and God indicate their state of spiritual health in each of these four domains. This model provided the basis for various assessments of spiritual health/well-being among school and university students and staff in Australia and the United Kingdom. The Spiritual Health in Four Domains Index, Spiritual Health and Life-Orientation Measure, Feeling Good Living Life and Quality of Influences Survey were developed for these and other studies in spiritual health.