In this Part of the document, one describes the preferences for the different solvers supported by FeResPost. Most preferences are defined as methods and member data of the classes specializing the “DataBase” class defined Chapter I.1. Presently two solvers are supported: Nastran and Samcef. The corresponding classes specializing “DataBase” class are “NastranDb” and “SamcefDb” classes. The corresponding preferences are described in Chapters III.1 and III.2 respectively. The diagram of Figure I.1.1 representing the “DataBase” hierarchy can be more precisely represented as in Figure 1.