Abstract: There is provided a wearable device and/or system for determining one or more of potential, imminent and actual touching of a user's face by the user's hand. The wearable device may comprise two sensors. The sensors may be configured to sense parameters indicative of the position and/or orientation of the user's arm, or part of the user's arm. A first sensor may be configured to sense an angle between the user's forearm and the user's upper arm. A second sensor may be configured to sense an orientation of the user's forearm with respect to gravity. The sensor signals may be sent to a processor for determining whether the user's arm position is indicative of face touching. The processor may be comprised as part of the wearable device, or the processor may comprised as part of the system separate to the wearable device, for example remote from the wearable device. The wearable device and/or system may comprise an output device for indicating that the user's arm position is indicative of face touching.