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# Interoperability
## 1. Introduction
The [European Interoperability Framework](https://ec.europa.eu/isa2/sites/default/files/eif_brochure_final.pdf) describes an interoperability model that is geared toward the public sector (See Figure 1). It describes a "stack" of interoperability subjects. As a general model it is useful to describe issues and solutions.
Figure 1: Visual representation of the interoperability model
The BDI has a focus on a wide generic technical interoperability between entities, supporting specialized/differentiated:
* semantic interoperability
* organizational interoperability
* legal interoperability
The world model describes how market forces, geo politics, regulation, culture and innovation will create a dynamic universe of sectors/groups that have an interest in driving specialized/differentiated interoperability within their group, at the expense of interoperability with other sectors.
## 2. Technical Interoperability
The design philosophy to enhance generic technical interoperability is based upon the following:
* No proprietary development of protocols
* Reuse known, proven or emerging open standards in a specific configuration
* Rely on already supported digital identities and other digital proofs of claims
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