A performance measurement device according to one or more aspects is configured to acquire sensing data obtained by measuring an activity relating to at least one of sensory activity and physical activity for a relevant worker； analyze the sensing data acquired and thereby calculate a performance index for each of the basic operations； compare the performance index required for each of the basic operations in a work step and the performance index calculated for each of the basic operations； and assign the worker a second work step where the performance index calculated for each of the basic operations satisfies a predetermined criterion in relation to the required performance index for each of the basic operations.
