Compared to superalloys, ceramic matrix composites (CMCs) offer reduced weight and superior specific properties at elevated temperatures. However, CMCs are prone to oxidation degradation when exposed to oxygen at high temperatures, which is the primary driver for useful life of the component. Accurate predictions of CMC life require accurate predictions of oxidation behavior, which require accurate values of the material properties that control the oxidation process. One of these key properties is permeability. In this effort, MR&D proposes to gather test data, then appropriately modify, correlate, and integrate a Multidirectional Composite Cylinders Assemblage (CCAMD) model with its current ABAQUS oxidation model. This will allow permeability to be calculated and updated continuously during an oxidation analysis as dictated by external loads, significantly enhancing the accuracy of current durability models.