The "'''''[[Sefer Mitzvot Gadol'''''"]] (ספר מצוות גדול; in [[hebrew language|Hebrewhebrew]]: ''The Great Book of [[Mitzvah|Commandments]]''; abbreviated סמ"ג "SeMaG" ), completed in 1247,<ref>{{Cite journal|jstor = 41310619|title = The Significance of Form: R. Moses of Coucy's Reading Audience and His Sefer ha-Miẓvot|journal = Ajs Review|volume = 35|issue = 2|pages = 293–321|last1 = Galinsky|first1 = Judah D|year = 2011}}</ref> deals with the 365 negative [[mitzvah|commandments]] and the 248 positive commandments, separately discussing each of them according to the [[Talmud]] and the [[posek|decisions]] of the Rabbis. "SeMaG" also contains much non-legal, moralistic teaching. References to the "SeMaG" are by section (positive or negative commandments) and a number for each commandment within its section.
Rabbi Moses' arrangement and presentation are heavily influenced by [[Maimonides]]' discussion of the commandments in the [[Sefer Hamitzvot]] and by his codification of the [[Halakha]] in the [[Mishneh Torah]]. However, unlike Maimonides, Rabbi Moses presents lengthy discussions of the different interpretations and legal opinions. He also makes extensive use of other [[Halakha#Codes of Jewish law|codes]], and particularly of the commentaries of [[Rashi]] and the [[Tosafot]], usually favouring these [[Ashkenazi Jews|Ashkenazi]] [[Oral Torah|traditions]] over Maimonides.