Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. NEi Software, founded as Noran Engineering, Inc., is an engineering software company. The company develops and publishes a high-performance Nastran FEA (finite element analysis) software program called NEi Nastran with an integrated graphical user interface and model editor. Thousands of organizations routinely use NEi Nastran to perform linear and nonlinear stress, dynamic, and heat transfer analysis. Support is also provided for specialized analyses such as PPFA (progressive ply failure analysis) composites, DDAM, optimization, fatigue, CFD and event simulation. Tightly integrated and often bundled with Femap processor by Siemens PLM Software, NEi Nastran has played a key role in the design of space vehicles, aircraft, naval vessels, automobiles, medical products, computers, electronics, and architectural structures developed over the past decade.