The Church Educational System (CES) Honor Code is a set of standards by which students and faculty attending a school owned and operated by The Church of Jesus Christ of Latter-day Saints (LDS Church) are required to live. The most widely known university that is part of the Church Educational System (CES) that has adopted the honor code is Brigham Young University (BYU), located in Provo, Utah. The standards are largely derived from codes of conduct of the LDS Church, and were not put into written form until the 1940s. Since then, they have undergone several changes. The CES Honor Code also applies for students attending BYU's sister schools Brigham Young University–Idaho, Brigham Young University–Hawaii, and LDS Business College.
Every year BYU has an "Honor Week" dedicated to celebrating the legacy of the Honor Code and to remind students of the importance of following it. Early forms of the CES Honor Code are found as far back as the days of the Brigham Young Academy (1875-1903). Early school president, Karl G. Maeser. Maeser created the "Domestic Organization", which was a group of teachers who would visit students at their homes to see that they were following the school's moral rules. In the 1901 school catalog this guide of conduct included a prohibition on "strong drink and tobacco", "profanity and obscenity", attending parties not under the control of "responsible persons", "keeping late hours, having improper associates, and visiting places of questionable repute". Maeser also, however, relied largely on individual student's honor and honesty in keeping the rules, intending faculty visits as times of counsel rather than espionage. After George H. Brimhall served as president, enforcement became somewhat more lax (there were no more faculty visits), but adherence to the same basic principles were encouraged. From 1910 to 1960 the annual student catalog would only contain a few brief sentences on student conduct and discipline, often mentioning the prohibition of tobacco, "improper associates", and "visiting places of questionable repute", though the 1930s and 40s saw increased standards regarding rules related to student housing and the dress code. Women were allowed to wear slacks only on Saturdays, and men wore uniforms for a short time.