A software program is executed, the software program requiring one or more physical interactions with a user through an input/output (I/O) device, wherein each of the one or more physical interactions includes respective predefined dimensions indicating a proficiency in performing one of the one or more physical interactions. The one or more physical interactions are tracked. A familiarity profile for each of the one or more physical interactions is generated based on the respective predefined dimensions for each of the one or more physical interactions. The software program is customized based on the familiarity profile for each of the one or more physical interactions.