Abstract: An apertured mask for enhancing the learning of specific functions controllable from an instrument panel by a trainee. In one embodiment, the mask for an instrument panel comprises an opaque overlay having at least one opening for revealing a group of instruments from this panel, and mounting means for retaining this overlay in a fixed relationship with the exclusive group of instruments. A plurality of juxtaposed flaps may also be provided for optionally covering a portion or an entirety of the opening of the mask. In another embodiment, any two juxtaposed flaps have along a common bordering edge thereof dust seal means for closing a gap between each flap. In a further embodiment, each mask from a plurality of masks for a same instrument panel, has a distinct set of apertures for revealing a distinct number of exclusive instruments from that panel, for teaching a trainee about a distinct process from a group of processes controllable from that instrument panel.