The conceptual HERMES data model describes the data and information from a methodology perspective and formulates their structure. Figure 11 shows the diagram of the data model. The universally usable open source data model is freely available and can be used by anyone for their own tools.

Figure 11: Diagram of the HERMES data model

The data model was developed using INTERLIS * INTERLIS is a description language designed to ensure long-term compatibility between different systems. INTERLIS is software- and system-independent. INTERLIS 2 is officially published as standard SN 612031. , a conceptual data description language of the Confederation. HERMES coherence, i.e. the uniform structure of the data in a method component, is determined with this data model (e.g. each task is assigned to a module). Implemented as a tool, the INTERLIS data model means being able to save, display, and generate method data, but also the effective project data, with the appropriate level of detail.

With the help of the HERMES data model and the INTERLIS description language, the aim is to advance the envisaged further development of new method components, but also the expansion of existing method components such as HERMES project management itself.