There used to be an Introduction section which competed with the rest of the article. First, the lead is supposed to be the intro (MOS:INTRO). Second, two sections titled in the same way (e.g., #History) cannot receive different incoming links. Third, many Intro subsections were very long, some were even longer (in prose) than the corresponding section outside of the Intro section, which contained mostly lists (via templates). If the intent was to create an introductory article, then it should have been split into Introduction to the International System of Units instead. It felt as if someone didn't like the existing article and decided to write a new one, except it was left in a subsection. fgnievinski (talk) 04:46, 14 August 2023 (UTC)

This article is too long and should not duplicate content in subtopics, such as SI base units, SI derived units, SI prefix, etc. Other notable subtopics could be mover into the respective main articles, e.g., SI#Realisation. fgnievinski (talk) 05:13, 14 August 2023 (UTC)