This mixed method exploratory case study was used to explore the effect data overload has on project management, how data overload affects project management effectiveness, how prepared program office staff is to manage multiple projects effectively, and how the program office's organizational structure and data management systems affect project management effectiveness. A 10-question survey was used to gather descriptions of the work experiences of 22 project managers and assistants at a United State federal agency program office in Mexico City, Mexico. Data were analyzed using an automated tool, namely, Survey Monkey software, and a manual approach that included reviewing project management documents and reports. The effectiveness of project managers and assistants was evaluated to determine their capacity to provide timely and accurate projects status reports. Project effectiveness was measured by determining if projects were delivered on time, within the allotted budget, and as originally planned or designed to perform. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]