Modalys objects are a collection of Mode Frequencies and Loss Coefficients for those frequencies, as well as a collection of modeshape (deformation) data for those frequencies. All objects share this common internal data structure, even though their physical descriptions from a user's point of view may be vastly different. As far as the user is concerned, Modalys objects are defined using a combination of physical measurements, material parameters and modal parameters, all of which can vary depending on the object being created. Many Modalys objects share common parameters, which we will describe here in order to avoid repetition in the individual objects’ reference pages. Remember that not all parameters apply to every object; the individual object reference pages will indicate which measurements and parameters can be used for that particular object.