The problem of this study was to identify some concerns of Korean kindergarten teachers at different points in their careers, based on the conceptual framework of Katz's (1972, 1977, 1985) theory of preschool teacher development. This study also described the variations in these concerns on the basis of some teacher characteristics including teaching experience, certification, educational background, inservice training, and teaching assignment. The subjects for this study were 174 volunteers who were Korean kindergarten teachers in Seoul, Korea. The concerns of the teachers were expressed through the Kindergarten Teacher Concerns Questionnaire, consisting of two parts: (a) background information, and (b) the Kindergarten Teacher Concern Rating Scale (KTCRS), consisting of a list of 54 items developed by Tsai (1990), reflecting the four areas of concerns—Survival, Consolidation, Renewal, and Maturity—formulated by Katz. A Likert type 5-point scale indicating the degree of concerns was used in the questionnaire as the scoring system. The following conclusions were drawn from this study: 1. The concerns of the Korean kindergarten teachers were developmental in nature in terms of preoccupation with a specific area of concerns at different points in the teachers' careers. This result tended to follow a sequence of stages as posited by Katz (1972, …