  The International System of Units (SI) is fundamental for the social, and not
only the scientific, role of metrology, and as such its understandability is a
crucial issue. According to the current draft of the new SI Brochure, the next
edition of the SI will be significantly more complex in its conceptual
structure than the previous ones. Identifying a strategy for effectively
communicating its main contents is then a worthwhile endeavor, in order to
increase the acceptance and thus the sustainability of the SI itself. Our
proposal is to focus on the semantic structure of the definitions: this is
instrumental to the awareness campaigns recommended by the General Conference
on Weights and Measures to make the next edition of the SI understandable by a
diverse readership without compromising scientific rigor.
