This study examined the greatest stressors in teaching situations that affect teachers, and how these events vary for groups of elementary, middle, and secondary school teachers. The list of possibly stressful situations was taken from the Teaching Events Stress Inventory (TESI), developed by Cichon and Koff in 1978. Data were collected from teachers representing 23 school systems who were attending workshops on stress in four different locations. The TESI contained 36 items that were potential stress producing events associated with teaching, using a 7-point Likert-type scale, with "O" indicating a non-applicable item. Questions fell into the general categories of: (1) personal security; (2) management conflict; and (3) teaching tasks. In analyzing results, two means and standard deviations were computed for each of the 36 items: the first set used "O" as a legitimate value and were included in the computations; the second set treated "O" as a missing value, not included in the computations. An analysis is presented of the findings, illustrated by tables. No significant differences were found across grade levels; however, years of teaching experience were a factor. When "O" was included in the computations, highest ranked stressors centered about items pertaining to discipline and misbehavior of students. Omitting "0" responses produced shifts in ranking, with stressors pertaining to personal professional matters becoming the highest rated stressors. (JD)