Designing and analyzing engineered products may require a variety of different types of analysis, such as nonlinear static or linear dynamic analysis on the same system. If we have a model already prepared for nonlinear analysis, can we use it directly for a linear dynamic analysis? Also, in many engineering applications, the dynamic behavior of a structure based on a prior linear or nonlinear status may be of interest. Although we know that a linear dynamic analysis is linear, what should we do if a model contains nonlinearities? Do we need to change the numerical model? How will the nonlinear properties be treated in the linear dynamic analysis? In this lesson, we'll explore the answer to these questions in more detail and investigate the ways to include nonlinearities in linear dynamic analysis. We begin with a brief lecture and then move on to a workshop demonstration of an electronic enclosure.