Table 1.

Company Challenges from articles of literature review; CACP—customer acquisition and contract planning, MPP—manufacturing process preparation, MP—manufacturing process, MPMI—manufacturing process monitoring and improvement.

Company’s Challenges	The Group to Which a Challenge Has Been Assigned	Citations	Industry 4.0 Technologies
Implementation Costs	CACP	[18,20,21]	-
Implementation Time	CACP, MPP	[18,19,20,21]	-
Technology Knowledge	CACP, MPP	[18,19,20,21]	Business intelligence
Safety and security	CACP, MP	[19,21]	Smart Personal Protection Equipment Cybersecurity protocols
Establishment of a comprehensive and reliable industrial broadband infrastructure	MPMI	[19,20]	-
Horizontal and Vertical Integration	CACP, MP	[18,19,20,21,23]	Decision support systems
Traceability	MP, MPMI	[21,23]	Supervisory control and data acquisition (SCADA) system Automated Guided Vehicles (AGV)
Reduction of Energy Consumptions	MP, MPMI	[18,23]	Intelligent process supervision
Additive Manufacturing Implementation	MP	[18,20]	Additive Manufacturing
Predictive Maintenance	MPMI	[18,23]	Predictive maintenance
Simulation Implementation	MPP	[18,20,24]	Intelligent process diagnosis Intelligent tool (e.g., drills, turning tools) management system
Automated and Integrated Robots	MP, MPMI	[18,20,21]	Automatic data collection Autonomous production systems with robots
Big Data Analytics	MPMI	[18,19,20,21]	Big data analytics
Demographic Challenge	MP	[22]	Supporting technologies and assistance systems
Calculation Challenges	MPMI	[24]	Artificial Intelligence techniques
Data Management	MPMI	[24]	Product Lifecycle Management, CAD/CAM tools
Design Automation	CACP	[24]	IoT
Production Automation	MP	[24]	Machine Learning, Knowledge-Based Engineering, Digital technologies embedded in robots, IoT