Kol Bo contains 148 sections embracing the following subjects: blessings, prayer, the synagogue, the meal, Sabbath and festivals, marriage, monetary matters, niddah, vows and oaths, halakhot relevant to Erez Israel, forbidden foods and issur ve-hetter, mezuzah, the redemption of the first-born son and the firstborn of an ass, visiting the sick, mourning, the takkanot of R. Gershom and others. Included in this anthology were also collections of laws from various works such as the Even ha-Roshah of R. Eliezer b. Nathan; laws from the Tashbez of R. Simeon b. Zemah Duran; from the Sefer Mitzvot Katan of R. Isaac b. Joseph of Corbeil; from R. Perez b. Elijah of Corbeil; R. Isaac, author of the Sefer ha-Menahel; R. Baruch b. Isaac of Worms, author of the Sefer ha-Terumah; and various responsa. The book is chiefly based upon Maimonides' Mishneh Torah, combined with and having additions from the rulings of the scholars of Germany, France, and Provence. Few of the rulings of Spanish scholars are cited (as against the Orhot Hayyim which adds many statements of such Spanish scholars as Nahmanides, R. Solomon b. Abraham Adret, R. Yom Tov b. Abraham Ishbili, and others). The anthology contains much material from various books, not all of which are extant today.