Abstract
The digital transformation of cultural heritage has expanded the availability of data while revealing structural forms of incompleteness. This study investigates how missing data are conceptualised in the scientific and design literature on digital cultural heritage and how Advanced Design can transform absence into a resource. The research combines a critical thematic review of peer-reviewed publications from 2010 to 2025 with Research through Design practices and case studies developed within the PNRR CHANGES project. The analysis identifies three main configurations of absence: processual gaps arising along the data lifecycle, epistemic exclusions embedded in standards and knowledge models, and projectual shortcomings related to governance and participation. Based on these findings, a design taxonomy and an operational model are proposed, linking each form of absence to specific levers of intervention, such as transparency of workflows, community-grounded annotation and narration, collaborative metadata writing, and long-term maintenance practices. The results show that Advanced Design provides an infrastructural and reflective framework capable of connecting technical processes, cultural interpretation, and community involvement. The study concludes that incompleteness, rather than a defect, can act as a generative condition for digital heritage, fostering more inclusive, situated, and transformative design practices.