## 4 Discussion of Results and Conclusions
The levels of innovation found are not uniform, as occurs with other kinds of heritage, with their own features adapted to the surrounding territory and to the internal logic of each production process. This diversity inevitably delays any homogeneity in applying any digital innovation. The webpages have been studied using a broad set of qualitative variables and producing a web popularity index (WPI) that simply and efficiently summarizes the information available in each place. The case study with the highest WPI is the Almaden mining area. The fact that its varied digital content is so carefully presented could have to do with it having been listed, since 2012, as a World Heritage Site by UNESCO, due to its exceptional values associated with the mining and international mercury sales. The next most outstanding examples, in terms of general compliance with the variables, are the San Blas de Sabero Ironworks, Anana Salt Mines, Royal Segovia Mint, Royal Glass Factory of La Granja de San Ildefonso, Cornella de Llobregat water lift, and Tarrasa Vapor Aymerich, Amat y Jover textile factory. All these case studies show above-average compliance of the variables established as an analysis reference. In the rest, the digital level drops and the information provided on the website is less complete. The variable with the highest level of compliance refers to the presentation of interesting content, followed by the attractive design and well-structured content, smart event calendar log, online promotion of other representative tourist attractions, and integrated presence in social media. The survey shows that the majority idea is that when applying technology, a decisive role is played by the economic cost, as well as the problems ensuing from its complexity. In any case, the majority opinion is that the selected places are evolving favorably towards being considered smart destinations (66%). The lowest scoring of all the blocks into which the survey was divided is the connectivity and innovation block, followed by the management block. In contrast, the sustainability and accessibility block is quite favorably perceived, especially regarding conservation of the landscape and available resources, the application of energy and water saving measures, and physical and digital accessibility to information. Notably significant in terms of the application of ICTs is their use in promoting tourism, and less in terms of ascertaining demand, resource management, and improving visitors' personal experience. Compensating for this imbalance is essential to improving the levels of digital intelligence and efficient management in the medium term, as well as to forecast the emergence of new consumer models with sounder criteria. Several main objectives must be achieved in the coming years to boost technological innovation and overcome current difficulties. An objective will be the best coordination between the different public administrations and local agents. Another objective will be the strategic creation of collaboration networks between the different places of industrial heritage. It will also be important to seek for funding to reduce high technological costs in the early stages of innovation, and specialized technical assistance that reduces the complexity of the implementation and development of new technologies. With these measures and other complementary ones, the digital tools will expand the cultural and tourist opportunities. The measures will facilitate the management of industrial heritage sites and will serve to disseminate the values of a legacy of enormous scientific and technical interest, with appropriate digital media for each resource. The process of technological improvement is slow and continuous over time, that is, in a permanent phase of change to introduce the necessary advances for the most active interaction with the cultural user in the selected places of industrial heritage. In some analyzed museum, the active effort for the progressive application of new technologies is recognized.