Technologies made for supporting learning are advancing very rapidly, especially applications that use virtual reality (VR) and augmented reality (AR): some meaningful examples are pilots training, tutoring of novice medical students in the operating room and firefighters’ preparation. These innovative tools make the learning process more engaging and interactive, making it possible for people to dive into environments which are not always easily accessible. The goal of this thesis is to study and improve applications that use procedural learning with VR/AR headsets, focusing especially on the user attention for optimizing the user experience and enhancing the level of assimilated knowledge. However, sometimes the prolonged exposition to these complex virtual environments could induce the user to lose focus and lead to cognitive overload, with the risk of compromising the learning effects and making this goal unattainable.