The study on cognitive workload is a field of research of high interest in the digital society.
The implementation of ‘Industry 4.0’ paradigm asks the smart operators in the digital factory
to accomplish more ‘cognitive-oriented’ than ‘physical-oriented’ tasks. The Authors propose
an analytical model in the information theory framework to estimate the cognitive workload
of operators. In the model, subjective and physiological measures are adopted to measure
the work load. The former refers to NASA-TLX test expressing subjective perceived work
load. The latter adopts Heart Rate Variability (HRV) of individuals as an objective indirect
measure of the work load. Subjective and physiological measures have been obtained by
experiments on a sample subjects. Subjects were asked to accomplish standardized tasks
with different cognitive loads according to the ‘n-back’ test procedure defined in literature.
Results obtained showed potentialities and limits of the analytical model proposed as well as
of the experimental subjective and physiological measures adopted. Research findings pave
the way for future developments.