TOTAL EFFICIENCY, PROCESS INTEGRATION, DIGITALISATION, BIG DATA, ANALYTICS: THESE ARE THE KEYS TO BUILD THE SMART FACTORY 4.0. THE CHALLENGE IS TO RAISE LEVELS OF PRODUCTIVE, ORGANISATIONAL, MANAGEMENT AND ENERGY EFFICIENCY BY OBTAINING PI’S HIGH LEVELS OF PRODUTTIVIT, BOTH AT THE LEVEL OF THE PROCESS AND THE LEVEL OF PRODUCT QUALITY.