  In the current industrial practices, the exponential growth in terms of
availability and affordability of sensors, data acquisition systems, and
computer networks forces factories to move toward implementing high integrating
Cyber-Physical Systems (CPS) with production, logistics, and services. This
transforms today's factories into Industry 4.0 factories with significant
economic potential. Industry 4.0, also known as the fourth Industrial
Revolution, levers on the integration of cyber technologies, the Internet of
Things, and Services. This paper proposes an Augmented Reality (AR)-based
system that creates a Cognition Level that integrates existent Manufacturing
Execution Systems (MES) to CPS. The idea is to highlight the opportunities
offered by AR technologies to CPS by describing an application scenario. The
system, analyzed in a real factory, shows its capacity to integrate physical
and digital worlds strongly. Furthermore, the conducted survey (based on the
Situation Awareness Global Assessment Technique method) reveals significant
advantages in terms of production monitoring, progress, and workers' Situation
Awareness in general.
