This study tests the use of a decision aid for Veterans who are facing a decision about surgery for their aortic abdominal aneurysms (AAA). The investigators will enroll Veterans with AAA who are candidates for endovascular or open surgical repair. There are 20 VA medical centers participating in the trial. Ten sites will be randomly assigned to the intervention group, and 10 sites will be randomly assigned to the control group. Twelve Veterans will be enrolled at each site. At sites assigned to the intervention arm, Veterans will receive a decision aid with information about the two types of surgery for AAA repair, open and endovascular, and complete a survey about their preferences. Veterans at control sites will complete the same survey, but will not receive the decision aid. After their surgery, Veterans will take another survey asking about their satisfaction. The investigators will compare the results of the survey between Veterans' in the intervention and control groups to determine the effect of the decision aid on agreement between preference and repair type.