The assessment of daily life stress in youngsters is receiving extensive research attention due to its pertinence to psychological and medical problems. This investigation addressed concerns from previous studies of daily life stress in children and adolescents. These included an integration with rathlgs of negative affectivity, exploration of developmental changes, and presentation of psychometric data. The Daily Life Stressors Scale (DLSS) is a 30-item measure designed to assess the severity of aversive feelings and evelyday events for youngsters. Three groups of children and adolescents were evaluated to assess the scale's test-retest reliability and construct and concurrent validity.Developmental changes in a normative group were also examined. Results indicated the DLSS to be moderately reliable and valid for children. Also, male children reported more stress than female children, whereas female adolescents reported more stress than male adolescents. Results were discussed with respect to resilience, gender role stress, therapy implications, and usefulness for determining precursors to physiological problems.KEY WORDS: daily stress; negative affectivity; childhood.Research on stress in children and adolescents has burgeoned in recent years, with investigators exploring both major life stressors (e.g., Kearney, Drabman, and Beasley parental divorce) and those that occur daily. Research into the effects of major life events on children predates work on daily life stressors, thus providing more information about assessment (Arnold, 1990), course (Cohen, Burt, & Bjorck, 1987), related effects (Kaplan, Grossman, Landa, Shenker, & Weinhold, 1986), and treatment (Noshpitz, 1990). Several researchers (e.g., Banez & Compas, 1990) have speculated, however, that daily life stressors may have greater impact on an individual's quality of life because these events are more frequent, psychologically proximal, and predictive of present and future psychological symptoms (Kanner, Coyne, Schaefer, & Lazarus, 1981).Common problems associated with increased stress in school-aged children include eating and sleeping pattern changes, lack of concentration or motivation at school, somatic complaints, and social withdrawal (Sears & Milburn, 1990). In addition, stress during adolescence is related to depression and suicide, substance abuse, eating disorders, and problematic parent-adolescent interactions (Hendren, 1990). Among more "clinical" populations, the effects of stressors such as relocation have been noted. For example, persons with mental retardation sometimes display increased maladaptive behavior upon relocation to another residential facility (Hemming, Lavender, & Pill, 1981), and youngsters placed in foster-care programs often show increased symptoms of internalizing and externalizing disorders (Tuma, 1989). Unfortunately, research into the assessment of daily life stressors in children is in its infancy and remains marked by several methodological and conceptual problems.Perhaps the most enveloping conceptual problem i...