Soyapango, El Salvador - April 2017 - On 29 April, at the Don Bosco University, the Rector, Salesian Brother Mario Olmos, gave a conference entitled "The Preventive System: A Spiritual and Educational Experience". The talk was attended by 65 members of the Association of Salesian Cooperators and leaders of various parish movements. The conference was coordinated by the National Councillor of the Apostolate of the Salesian Cooperators in El Salvador.