This paper presents a model, drawn from research on stress and on self and identity, of the decision to change oneself. In this model, the impetus for intentional self-change can be provided by a stressor-chronic role strain, a life event, or both. Stressors can implicate the self by generating unfavorable reflected appraisals, threatening competent identity performance, and generating unfavorable social comparisons. Any of these effects can reduce self-efficacy, self-esteem, and sense of authenticity, thus leading to psychological distress. Whether this impetus will lead to a resolve to change oneself is hypothesized to depend on six conditioning factors: 1) the identity-relevance of the stressor, 2) whether one attributes responsibility for a stressor to oneself, 3) awareness of and access to structural supports for self-change, 4) the belief that one can effect self-change, 5) the extent to which the benefits of changing are perceived to outweigh the costs, and 6) social support for self-change. Finally, the decision to change oneself may be precipitated by a critical event that causes persons to view their circumstances differently, usually by influencing one or more of the conditioning factors. Several types of critical events are described.