The four smarts of Industry 4.0: Evolution of ten years of research and future perspectives.

• We analyze how the Industry 4.0 literature has evolved during its 10 years. • We perform a systematic machine learning-based literature review of 4,973 papers. • We analyze 4 Smarts: S. Manufact., S.Working, S.Supply Chains and S.Product-Services. • We show the growth of these four smart dimensions and the interrelationships. • Future opportunities are highlighted for journals and specific fields of research. The Industry 4.0 literature has exponentially grown in the past decade. We aim to understand how this literature has evolved and propose future research opportunities. We focus on four smart dimensions of Industry 4.0: Smart Manufacturing, Smart Products and Services, Smart Supply Chain, and Smart Working. We perform a machine learning-based systematic literature review. Our analysis included 4,973 papers published from 2011 to 2020. We conducted a chronological network analysis considering the growth of these four dimensions and the connections between them. We also analyzed keywords and the main journals publishing on these four smart dimensions. We show that the literature has mainly been devoted to the study of Smart Manufacturing, although attention to the other smart dimensions has been growing in recent years. Smart Working is the less explored dimension, with many opportunities for future research. We show that research opportunities are concentrated in the interfaces between the different smart dimensions. Our findings support the vision of Industry 4.0 as a concept transcending the Smart Manufacturing field, thus creating opportunities for synergies with other related fields. Scholars can use our findings to understand the orientation of journals and gaps that can be fulfilled by future research. [ABSTRACT FROM AUTHOR]