For roughly four centuries the standard form of Christian catechetics was the printed catechism itself, a fixed sequence of questions with fixed answers meant to be memorized. Martin Luther's Small Catechism, published in 1529, set the pattern that much of Western Christianity followed afterward, covering the commandments, the creed, the Lord's Prayer and the sacraments in short question and answer units meant to be taught first in the household and confirmed by a pastor. Catholic catechisms followed a comparable form, and in the United States the Baltimore Catechism, first issued in 1885, held that role for generations of Catholic schoolchildren through its own memorized question and answer sequence.
The twentieth century brought a deliberate move away from that model, most visibly in the Catholic restoration of the adult catechumenate after the Second Vatican Council. Rather than a fixed text to be memorized in advance of baptism, the restored process treats catechesis as a staged formation extending over months, built around the liturgical calendar and involving the whole worshipping community rather than a private lesson between a candidate and a teacher. Other traditions made comparable moves toward formation centered instruction over rote recitation in the same period. The shift did not retire the catechism, which many traditions still use as a reference text, but it changed what catechetics itself is understood to be: not primarily the transmission of a memorized text, but a guided process of formation into a community's practice as much as its belief.