The fourth industrial revolution, or Industry 4.0, builds on the present adoption of computers and automation with smart and autonomous systems fuelled by data and machine learning to create intelligent factories and production units. Industry 4.0 should not be seen just as the introduction of new gadgets into already existing industries, but it should be seen as a space where the process, product, technology, and people all are intertwined. Volume two looks at issues relating to security within industry 4.0, the role of Signal processing in the development and implementation of control and management systems and again features case studies and applications from different industries, and reviews present and future opportunities for the role of signal processing in the future development of Industry 4.0.