1. Kagermann, H., Wahlster, W., Helbig, J.: Recommendations for Implementing the Strategic Initiative INDUSTRIE 4.0: Securing the future of German Manufacturing Industry. National academy of science and engineering, Wirtschaft und Wissenschaft begleiten die Hightech-Strategie. Final report of the Industrie 4.0 Working Group (2013)
2. Akdil, K.Y., Ustundag, A., Cevikcan, E.: Maturity and readiness model for industry 4.0 strategy. In Ustundag, A., Cevikcan, E. (eds.) Industry 4.0: Managing the Digital Transformation, pp. 61–94 Springer International Publishing, Cham (2018)
3. Issa, A., Hatiboglu, B., Bildstein, A., Bauernhansl, T.: Industrie 4.0 roadmap: framework for digital transformation based on the concepts of capability maturity and alignment. Procedia CIRP. 72, 973–978 (2018)
4. Schuh, G., Gartzen, T., Rodenhauser, T., Marks A.: Promoting work-based Learning through INDUSTRY 4.0. Procedia CIRP 32, 82–87 (2015)
5. ISO.: ISO 22400. Automation systems and integration - Key performance indicators (KPIs) for manufacturing operations management (2015). https://www.iso.org/obp/ui/#iso:std:iso:22400:-2:ed-1:v1:en