In today’s selection, we read the call for the restoration of an adult catechumenate:
The catechumenate for adults, comprising several distinct steps, is to be restored and to be taken into use at the discretion of the local ordinary. By this, means the time of the catechumenate, which is intended as a period of suitable instruction, may be sanctified by sacred rites to be celebrated at successive intervals of time.
This restoration has been hailed as one of the successes of the council. In Christianized countries, it is used for the switching (I would only use the term “conversion” for non-believers) of baptized (usually believers) Christians to Catholicism. The General Introduction to the RCIA is fascinating reading. It often convicts parishes (or would, if they read it) of an incomplete restoration. But that’s a topic of another thread or series.