This thesis presents a thorough review of the available literature on issues relevant to transport phenomena in polymer electrolyte membranes. The insight gained in the literature review is used in the development of a transport model based on the Binary Friction Model (BFM). A competing model, the Dusty Fluid Model (DFM), is not used because there are still some unanswered questions regarding the introduction of additional viscous terms. The transport model is then applied to 1100 EW Nafion. In order to investigate the unknown parameters in the transport model, a simplified conductivity model, termed the Binary Friction Conductivity Model (BFCM), is developed. Available experimental conductivity data measured using the AC impedance method is translated to give conductivity as a function of the number of water sorbed per sulfonate head using curve fits to sorption isotherm data. The unknown parameters are then fit so that the results of the BFCM lay within the expected range of conductivity values at 30°C. Whenever possible, values obtained in literature are used to corroborate the magnitude of unknown parameters. The diffusion coefficients are then assumed to all have the same temperature dependence and are adjusted to fit to experimental data at 70°C. The diffusion coefficients are assumed to have Arrhenius-type temperature dependence. Activation energy is calculated using the reference difksion coefficients found at 30°C and 70°C. The temperature dependence is found to be reasonable by comparison of our predicted conductivity to data at 40°C. The conductivity model is compared to two other models and found to provide a more reasonable fit over the entire range of water contents. The BFCM is also implemented with slightly modified parameters to show its ability to predict conductivity of membranes within the family of perfluorosulfonic acid membranes. One advantage of the BFCM model and the associated transport model is that by fitting the BFCM to conductivity data we are able to gain insight into all the transport parameters, which could be used to predict water transport through the membrane.