The European Library of Architecture Principles (ELAP)* is intended to direct government organisations in initiating changes and implementing IT projects. Particularly when analysing or designing new or modified services, it is necessary to highlight how the interoperability-enabling principles are implemented and which considerations are taken into account. The apply-or-explain principle applies here, whereby deviations are permitted provided that they are substantiated and recorded with good arguments so that they can be revisited at a later stage. This prevents important points from being overlooked.

The principles in ELAP are described in relation to relevant policy frameworks, established standards, building blocks and examples that are already available, so that they are as acknowledge as possible.

*The identification of different EU legislation and policies regarding the digitalisation of public services and the establishment of standardisation initiatives is an in-progress process. ELAP is therefore subjected to a continuous work that the CAMSS Team performs on a regular basis together with other solutions.

• It is an EC solution that helps analysing and modelling infrastructures and designs based on architectural principles.
• It follows goals of the interoperability programs within public institutions in Europe, notably the EIF. Check out the EIF Perspective attributes of ELAP.
• It efficiently provides means to visualise solutions and their compliance with recommended interoperability frameworks. 

Analysis of requirements of an Interoperable Solution (Digital Public Service incl.), which will then impact on the step for designing it.