Progressive and systemic accumulation of inconsistencies at all levels of a digital ecosystem: interface (components, patterns, visual hierarchies), language (terminology, tone, messages), structure (information architecture, navigation logics), technical (faulty interoperability, data silos, compartmentalised systems) and content (redundancies, contradictions, obsolescence).

This debt results from decisions taken without taking into account the whole picture (brand identity, IT eco-system, etc.), creating increasing desynchronisation between system components. For example, it forces internal teams to carry out manual compensation operations (re-entries, copy-paste, ad hoc synchronisations) to maintain artificial consistency, generating errors and desynchronisation.

For the end user, this means a breakdown in the continuity of experience: interface inconsistencies, contradictory or out-of-sync information, fragmented paths requiring repeated contextual changes, increased cognitive load and increased friction. These degradations gradually erode trust and the perceived reliability of the service.