1. A system comprising: a head mounted device mountable to a head of a pilot; at least one vital signs sensor couplable to a body part of said pilot and configured to repeatedly obtain in real time, vital signs data associated with said pilot; at least one accelerometer embedded within said head mounted device and configured to repeatedly obtain in real time head-related data associated with position and orientation of the head of said pilot; and a computer processor configured to: simultaneously receive the vital signs data, the head-related data and real-time platform data indicative of the platform controlled by said pilot as an input to a decision function, said platform data including linear and/or angular velocities of the platform and derivatives thereof; check the head-related data against the platform data; and generate as an output of the decision function, a prediction of pilot incompetence, before the pilot incompetence has occurred, based on said input and predefined criteria.