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.