Quadrant Engineering has gained exposure to a wide variety of applications for multibody dynamics (MBD) and has found that the commonly used rigid-body assumption is extremely limiting. Quadrant has experience incorporating flexible components and joints using linear, modes-based, and nonlinear representations, as well as material nonlinearities and contact, into MBD simulations to simulate dynamic responses more accurately. Complex mechanical assemblies present design challenges that require a dynamic system-level analysis to be met. Motion analysis enables one to meet these challenges by quickly evaluating and improving designs for important characteristics like performance, safety and comfort.