## 1 Introduction
### General Strategies Adopted and the Added Value of the Project
#### 1.4.3 Sustainability and Long-Term Preservation  
In terms of technological solutions and interaction interfaces, it is important to consider that the project was developed in 2021-2022, during the pandemic. This condition also determined some constraints since the Superintendencies firmly discouraged the use of shared devices in favour of the widest use of personal devices. In many cases, Superintendencies expressed general concerns also about the medium-long-term sustainability of technologies and their daily management because of the shortage of economic and human resources to be addressed to support visitors. For this reason, the online platform constitutes the backbone of the project. However, some site-specific installations were also realized in museums in Cerveteri and Sirmione. In collaboration with experts in accessibility, such installations allowed us to experiment with innovative solutions, designed according to the universal design principles. Figure 3: Virtual reconstruction of a domus in Egnazia, with museum objects contextualized. Furthermore, about 7 months after the public presentation of the project (which took place on 6 June 2022 in Rome), thanks to the fading of the COVID emergency, we are now recovering the use of shared interaction interfaces within museums instead of individual personal devices so as to favour a more collective experience and social cultural exchange. The main principles leading the multimedia design of the e-Archeo project were: innovation, sustainability (both in terms of technologies whose daily management and maintenance rely on the archaeological parks' personnel and of contents that can be reused by the Superintendencies for new developments), open science, synergy and know-how exchange between the research, public and private sectors. Another issue of the project, connected to the long-term sustainability and usefulness of digital productions, is the open data and open source policy. Both universities and creative industries have been convinced to publish on the Zenodo European platform [37]:  
(1) All the original data coming from their previous research or surveys, brought as a 'dowry' and made available at the beginning of the project (e.g., point clouds, photos, plans, landscape studies, written texts);  
(2) All the datasets processed and produced during the project following the new guidelines and the template given by the e-Archeo coordination team (e.g., 3D models, rendering, movies, screenplay and storytelling, scientific backend). Zenodo is a repository on the web, aiming at collecting, preserving and diffusing the scientific production of an institution (or of a discipline), allowing external users to access the digital objects which it includes and their metadata. Zenodo is not the only repository with such characteristics existing today, but it has been specifically created for scientific institutions and it follows FAIR principles [30]; it is managed by CERN [38] for OpenAIRE (UE) [39]. Specific guidelines and tutorials have been designed by the coordination team also to structure the scientific backend [40] metadata and paradata to be associated with the published contents, also useful for making data searchable and findable in the future [33]. The e-Archeo collection [41] was created in Zenodo in order to take under a common \"umbrella\" all the contents produced in the context of the e-Archeo project. We consider a successful result to have convinced academies and private industries to release their research and products for free on Zenodo in interoperable formats. Of course, they were free to choose the kind of license they preferred, even if the \"Creative Commons Attribution NonCommercial Share Alike 4.0 International\" one has been encouraged by the coordination team [42]. This kind of license allows the reuse of data exclusively for scientific purposes and, even in the case of modification, data must be published keeping the same license.