Spotti, SamueleBonifazi, FedericaMassidda, MarcelloPescarin, SofiaTravaglini, LauraCampana, StefanoFerdani, DanieleGraf, HolgerGuidi, GabrieleHegarty, ZackaryPescarin, SofiaRemondino, Fabio2025-09-052025-09-052025978-3-03868-277-6https://doi.org/10.2312/dh.20253148https://diglib.eg.org/handle/10.2312/dh20253148The concept of authenticity has gained growing importance in the design of digital, hybrid, and XR experiences within the Cultural Heritage (CH) sector. In earlier research [PCS24], we examined authenticity through a multidisciplinary lens, combining a state-of-the-art review with empirical data collected via a Cultural Probe Kit (CPK) to explore user perceptions of authenticity in interactive experiences. From this, we developed a multidimensional authenticity framework, structured around three core dimensions: Self, Others, and World. This paper focuses on translating that framework into actionable design strategies through the PERCEIVE Co-design tool-a free resource composed of a card deck, board worksheets, and activity guidelines. Available as both a physical board game and a web app (in development), the tool supports designers and cultural experts through a step-by-step process to ensure authenticity is embedded in the experience design. By encouraging collaboration and creativity, it promotes the development of engaging, emotionally resonant digital experiences. Additionally, we created a custom GPT assistant to support iterative brainstorming and UX ideation around authenticity. The co-design outcomes were then used to shape the exhibition design strategy of Reconstruct & Relive, the final showcase of the PERCEIVE project (Ch.3).Attribution 4.0 International LicenseCCS Concepts: Authenticity → Extended reality; Hybrid experiences, Digital experiences; Design → codesign; Cultural Heritage → Digital Cultural HeritageAuthenticity → Extended realityHybrid experiencesDigital experiencesDesign → codesignCultural Heritage → Digital Cultural Heritage10.2312/dh.202531484 pages