Date of Award


Document Type


Degree Name

Master of Science


Department of Operational Sciences

First Advisor

John O. Miller, PhD.


The Execution and Prioritization of Repair Support System (EXPRESS) is a database tool used by the Air Force to prioritize depot maintenance of reparable spare parts to maximize responsiveness to warfighter need. Many studies have examined individual portions of EXPRESS, though few have examined it as an entire system. This effort proposes a modeling approach for examining the overall system behavior of EXPRESS using discrete event simulation. The emphasis of the model is to be flexible enough to provide useful insight into system performance, while also remaining open-ended enough to provide a foundation for future expansion and analysis. A case study involving three reparable parts managed by EXPRESS, based on 6 months of real world data, focuses on total Mission Capability (MICAP) hours as a measure of responsiveness to customer need. The model is validated using data on actual MICAP hours for the modeled period. The case study simulation is then used to study the impact on responsiveness and repair behavior resulting from running EXPRESS less frequently. Output data points to increases in total MICAP hours and variance in repair workload as run frequency decreases. The conclusion is that running EXPRESS less frequently negatively impacts system performance for both the maintenance and warfighter communities

AFIT Designator


DTIC Accession Number