## 4 Discussion and Conclusions  
The result of this research is the Industry 4.0 HUB platform, which has been completely developed and online since January 2021 at the following link: i40-hub.com. This research presents the qualitative advantages of using the collaborative KT platform Industry 4.0 HUB:  
* The Industry 4.0 HUB creates a single source for Industry 4.0 KT for SMEs. Every SME willing to implement Industry 4.0 technologies does not need to seek hundreds of papers, books, and platforms as everything is available in just one website, which covers the lack of knowledge highlighted in Section 1. Additionally, the resources needed to start the Fourth Industrial Revolution are minimized. * The HUB provides real-time SME access to an immense collection of Industry 4.0 use cases. * The Collaborate and Networking modules allow SMEs to enter use cases and share Industry 4.0 knowledge and resources, creating a collaborative network. * The Roadmap module helps SMEs enter the new era of manufacturing using a simple process that does not require complex expertise or big teams. Industry 4.0 KT must be simplified for the SMEs, especially for the microenterprises, and therefore, a single source platform like the Industry 4.0 HUB could provide the solution to the deficiency identified. As was previously mentioned, DIHs and _Plattform Industrie 4.0_ are great initiatives and key enablers for the transition toward Industry 4.0 and digital transformation for European SMEs. The European network of DIHs will help companies to improve their processes, products, and services using digital technologies, and they will provide access to technical expertise and experimentation, but the authors wanted to propose a different way to improve the Industry 4.0 KT between SMEs. Table 2 highlights some of the differences between the Industry 4.0 HUB, the _Plattform Industrie 4.0_, and the DIHs. In conclusion, the Industry 4.0 HUB supports the transition toward Industry 4.0 for SMEs by using a different approach than the one used in _Plattform Industrie 4.0_ and the DIHs. The Industry 4.0 HUB aims to eliminate unnecessary barriers and to simplify Industry 4.0 KT. However, this study has some limitations which may be addressed through future studies. The first limitation is that further analysis of the quantitative results for the Industry 4.0 HUB is still required. A representative number of SMEs need to start usingthe platform to start gathering data and scaling the solution to adapt it to each SME's needs. The second limitation is the development of the Industry 4.0 HUB website, which requires further improvement and bug fixing, as well as the creation of new capabilities for SMEs. Another possibility that should be studied is the usage of a different programming framework, such as a content management system (CMS) like Drupal, which could simplify the scalability and maintainability of the platform. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Platform** & **Scalability** & **Resources** & **Networking** & **Technical** \\  & & & & **Expertise** & **Specialization** \\ \hline DIH & & & & & \\ \hline _Platform_ & & & & & \\ _Industrie 4.0_ & & & & & \\ \hline Industry 4.0 HUB & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Comparison between Industry 4.0 HUB, DIH, and _Platform Industrie 4.0_. * [PERSON] et al. (2018) [PERSON]; [PERSON]; [PERSON] Knowledge Transfer and Introduction of Industry 4.0 in SMEs: A Five-Step Methodology to Introduce Industry 4.0. In _Analyzing the Impacts of Industry 4.0 in Modern Business Environments_; IGI Global: Hershey, PA, USA, 2018; p. 27. * [PERSON] (2018) [PERSON] Knowledge is power--What get in the way of digitalization. _Product. Manag._**2018**, _23_, 16-18. * [PERSON] (2015) [PERSON]; [PERSON] Defining knowledge management: Toward an applied compendium. _Online J. Appl. Knowl. Manag._**2015**, \(3\), 20. * [PERSON] and [PERSON] (2000) [PERSON]; [PERSON] A Framework for Characterizing Knowledge Management Methods, Practices, and Technologies.