Executive SummaryRecently, long-fiber thermoplastic (LFT) composites have attracted great interest within the automotive industry since these materials offer much better structural performance (e.g. higher elastic moduli, strength, and durability) than their short-fiber analogues, and they can be processed through injection molding with some specific tool design. However, to be able to compute the properties of injection molded LFTs, there is an important need to develop process models and computational tools to predict the microstructure of these composites. The microstructure of injection molded LFTs is governed by i) flow-induced fiber orientation, ii) fiber breakage during injection molding, and iii) processing conditions (e.g. pressure, mold and melt temperatures, mold geometries, injection speed, etc.). Under the Cooperative Research and Development Agreement (CRADA) Nr. PNNL/260 between Battelle as Operator of Pacific Northwest National Laboratory (PNNL) and Autodesk, Inc. (hereinafter "Autodesk"), process models developed by the University of Illinois for predicting fiber length and orientation distributions in injection-molded LFTs were implemented in the research versions of Autodesk Moldflow Insight (AMI) software packages (hereinafter "Moldflow"). These models were then used in the Moldflow injection molding simulations of simple and small-scale long-glassfiber/polypropylene samples.