The informative process on Isidoro Zorzano took place in Madrid between 1948 and 1961. In total 71 witnesses testified, including St. Josemaría Escrivá. Later Blessed Paul VI and St. John Paul II modified the norms for causes of canonization. As a result, an additional process for Isidoro’s cause was conducted between 1993 and 1994. The Congregation for the Causes of Saints decreed the validity of both the informative and the additional processes in 1994.
On March 25, 2006, the “positio” on the life and virtues of the servant of God was presented in the Congregation for the Causes of Saints. On November 17, 2015, a special meeting of the theological consultors gave a positive response to the question of the heroic exercise of the virtues by Isidoro Zorzano. On December 13, 2016, the ordinary session of the cardinals and bishops confirmed this judgement.
On Wednesday, December 21, 2016, Pope Francis received from Cardinal Angelo Amato, prefect of the Congregation for the Causes of Saints, a detailed report of the phases of the cause. The Holy Father ratified the vote of the Congregation and authorized that a decree be published declaring the servant of God Isidoro Zorzano venerable.