Method for improving the efficiency of vehicles or vehicle systems with and without weapon systems during operation, maintenance and servicing, characterized by the following steps: - building up of class models for diagnosis, for systematic identification/categorization of system components, with rules, in order to be able to administer assemblies reliably in logical processes, wherein the assemblies are unambiguously assigned to a specific class/category of system components, - specification for the respective class with which data it supports logistic processes in its current state, wherein the data comprises at least the installation date, the failure date with the operational performance achieved and a fault description as well as data which relate to the vehicle as a whole, - wherein when necessary the assembly can be changed from one class to another class in order, for example, to provide better process assistance, wherein the necessary measures for converting the respective class are assigned, - the origins and possible uses of data are considered on the basis of the classes of the class model with rules, - the data is listed, on the one hand, according to a system reference or assembly reference and, on the other hand, according to data categories, - the data is additionally transmitted to a central unit, as a result of which the data items of individual vehicle families are compared with one another and said data items are used for the failure prediction of the components of other vehicle members, and - in this way information about the availability, about operation data and about evidence control is established and can then itself engage in the logistics. - building up of class models for diagnosis, for systematic identification/categorization of system components, with rules, in order to be able to administer assemblies reliably in logical processes, wherein the assemblies are unambiguously assigned to a specific class/category of system components, - specification for the respective class with which data it supports logistic processes in its current state, wherein the data comprises at least the installation date, the failure date with the operational performance achieved and a fault description as well as data which relate to the vehicle as a whole, - wherein when necessary the assembly can be changed from one class to another class in order, for example, to provide better process assistance, wherein the necessary measures for converting the respective class are assigned, - the origins and possible uses of data are considered on the basis of the classes of the class model with rules, - the data is listed, on the one hand, according to a system reference or assembly reference and, on the other hand, according to data categories, - the data is additionally transmitted to a central unit, as a result of which the data items of individual vehicle families are compared with one another and said data items are used for the failure prediction of the components of other vehicle members, and - in this way information about the availability, about operation data and about evidence control is established and can then itself engage in the logistics.