Lean, digitalization, and sustainability are the key paradigms for the future of production systems. By helping to address global challenges such as demographic change, energy crises, and cost pressures, these production paradigms play a central role in the successful transformation of manufacturing companies, thereby also affecting their competitiveness. A unified modeling of these paradigms for production systems (PSs) can ensure a systematic selection of lean, digital, or sustainable measures on the way to a future-proof PS. In addition, the unified modeling of the paradigms enables cross-paradigm comparability and thus forms the basis for deriving synergy potentials within a future-proof PS, as well as for assessing the maturity of these paradigms holistically. This paper aims to model lean, digital, and sustainable PSs using the three levels: Areas, overarching elements, and elements. To this end, the article uses various methods such as a literature review, a cluster analysis, and a Delphi study.