Finite element modeling (FEM) technology is one of the most powerful tools used to design new processes and products. However, FEM users need data and models to characterize the materials used to fabricate the new products. In order to help manufacturers use more aluminum alloy sheet, appropriate material models are needed to analyze and design processes and parts specifically for these materials. This work describes aspects of constitutive modeling for aluminum alloys based on two significant microstructural features: Crystallographic texture and dislocation microstructure. Examples of constitutive equations and their applications to numerical sheet forming process analysis and design are provided in this work.