This study will look at how people cope with an upcoming bone marrow transplant and how personality characteristics influence coping styles in stressful medical situations. Personality traits, such as extraversion, optimism and self-esteem have been related to active, problem-focused coping styles, whereas neuroticism has been related to increased psychological distress and denial as a way of coping. Coping styles, in turn, have been related to disease outcome. For example, a fighting spirit and avoidance have been correlated with longer survival, whereas fatalism, anxious preoccupation and feelings of helplessness and hopelessness were related to a poor disease outcome. A better understanding of the relationship between coping styles and personality may help improve supportive care for people undergoing bone marrow transplants. This study will: