View source for Klalei HaPsak (Halachic Decision Making)

==Talmud Bavli and Yerushalmi==
== Geonim ==
# The term "Geonim" generally refers to those who lived between the Savoraim and the Rif, though the institution of Geonim did extend beyond then. Some say that the term Gaon is short for "Rosh Yeshivat Gaon Yaakov,"<ref>https://www.jewishvirtuallibrary.org/gaon</ref> while others claim it was reserved for those who were experts in all sixty Masechtot of Shas, corresponding to the Gematria of גאון.<ref>Yad Malachi (Klalei HaGeonim 1)</ref>
# The monograph on Hilchot Tefillin from the times of the Geonim is claimed by some to be super authoritative, as "the words of the Geonim are tradition" (דבריהם דברי קבלה) in that they had access to the first edition of Talmud Bavli, which was clearer than ours. At the same time, a number of Rishonim poke holes in the work and argue it shouldn't be followed when it contradicts Talmud Bavli.<ref>Yad Malachi (Klalei HaGeonim 2)</ref>
== Bahag (Ba'al Halachot Gedolot) ==
==Rif==
== Rambam ==
# When a contradiction is found between the Perush HaMishnayot and the Mishneh Torah, the Halacha follows Mishneh Torah, which was written later and as a set of rulings, not a set of elucidations of the Mishnah.<ref>Yad Malachi (Klalei HaRambam 1)</ref>
# In Mishneh Torah, the Rambam focuses on relaying rulings explicated in the Gemara in a lucid way, while leaving out rulings that can only be inferred but aren't stated explicitly.<ref>Yad Malachi (Klalei HaRambam 2)</ref>
# Every word of the Rambam is written with tremendous precision and exactness, enough for one to infer from his words as one would from the Gemara itself.<ref>Yad Malachi (Klalei HaRambam 3)</ref>
# It is not uncommon for the Rambam to pin a ruling on a Pasuk not mentioned in or even rejected by the Gemara, because he felt it to be simpler or more acceptable, especially if there's no practical difference.<ref>Yad Malachi (Klalei HaRambam 4). See the Shut Rama MiFano Siman 108 he cites who says that the Rambam will often present a ruling borrowing the wording of one opinion but adjust it to match the other.</ref>
# One cannot infer from the presentation of a ruling in one section of Mishneh Torah and its absence in another seemingly appropriate section that it only applies in one and not the other, as the Rambam's goal is to present the Talmud's rulings in their wording in their appropriate place. For example, a Halacha in Terumot that might also fit in Maachalot Assurot cannot be assumed to only apply in Terumot and not Maachalot Assurot given its presence in the former and absence in the latter. This is, however, a valid tool in reading other Poskim, such as the Tur.<ref>Yad Malachi (Klalei HaRambam 5)</ref>
# Though the Rambam never relies in Mishneh Torah on what he already wrote in Peirush HaMishnayot, he does rely on what he wrote in earlier sections of Mishneh Torah, and perhaps even later ones.<ref>Yad Malachi (Klalei HaRambam 6)</ref>
# The term "MiDivrei Sofrim" can refer to Dinim MiDeRabbanan, as well as any Din MiDeoraita not stated explicitly in the Torah, such as one derived via the thirteen Middot, because without the Chachamim it would not be understood.<ref>Yad Malachi (Klalei HaRambam 7)</ref>
# One cannot pose questions from Tosafot's logic against the Rambam. Gavra aGavra KaRamit?!<ref>Yad Malachi (Klalei HaRambam 8)</ref>
# The Rambam will rule like a Halacha found in the Sifrei if it's not contradicted by the Talmud.<ref>Yad Malachi (Klalei HaRambam 9)</ref>
# The word Assur is used even when referring to Dinim MiDeoraita that would warrant Malkot.<ref>Yad Malachi (Klalei HaRambam 10)</ref>
# When the Gemara presents more specific arguments predicated on accepting one of two possible assumptions - "Im Timtzi Lomar" - the Geonim and Rambam understand that the Halacha assumes like that assumption.<ref>Yad Malachi (Klalei HaRambam 13)</ref> Some say this is only true if the Gemara did not leave the very same uncertainty pending with a "Tiku" elsewhere, while others argue the opposite.<ref>Yad Malachi (Klalei HaRambam 14)</ref>

==Ra'avad==
==Rashi==
==Tosafot==
== Shulchan Aruch ==

== Sources==
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