Adolescent stress has been associated with serious health consequences and the need for mental health professionals to engage with adolescents as these young people strive to develop healthy lifestyles has never been more critical. To meet this need, an efficient measure of hassles in the junior high school population was developed to provide practitioners and researchers with an efficient measure which produces valid and reliable data. The development of this instrument--the Adolescent Perceived Events Scale (APES)--is reported along with some modifications to the scale so as to make it more useful to researchers. Although APES has been shown to produce both reliable and valid scores, its 202 items make the scale time consuming when conducting research or when using it in an applied setting. APES assesses hassles in five content domains, yet research has shown that the areas of peer, school, and family hassles are of greatest concern to the early adolescent. Using only these three domains, APES was modified into a 34-item measure. This measure was then administered to 406 junior high school students. Scores on the revised and shortened version of the APES were found to be both reliable and valid. Contains 21 references. (MKA)