DESCRIPTION The European Library of Architecture Principles (ELAP) ABB is a principle intended to direct government organizations in initiating changes and implementing IT projects. Particularly when designing new or modified services, it is necessary to make visible how the principles are implemented and which considerations are made in this regard. 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 matters from being overlooked. SOURCE https://joinup.ec.europa.eu/collection/common-assessment-method-standards-and-specifications-camss/solution/elap