If the ordinary thinks that the matter must proceed by way of extrajudicial decree: 1/ he is to inform the accused of the accusation and the proofs, giving an opportunity for self-defense, unless the accused neglected to appear after being properly summoned; 2/ he is to weigh carefully all the proofs and arguments with two assessors; 3/ if the delict is certainly established and a criminal action is not extinguished, he is to issue a decree according to the norm of cann. 1342-1350, setting forth the reasons in law and in fact at least briefly.
Source: Code of Canon Law (Vatican.va)