​​​​​​​One of Christ's missions to His Church is teaching the Gospel message to all people. The fulfillment of that mission and its authentic interpretation rests primarily on the pope as the successor of St. Peter and on the bishop in his diocese. Catholic schools are a principal response to this mission. Within the Archdiocese of Los Angeles, the archbishop, as chief teacher of the Catholic faith, holds the ultimate responsibility for Catholic schools. The archbishop shares this responsibility with the Department of Catholic Schools​. The Department of Catholic Schools is related to all the Catholic schools in the archdiocese even though the nature of the relationship and the subsequent accountability varies depending on whether the school is archdiocesan, parish, or private (independent).​

Our Lady of the Assumption school is a ministry of Our Lady of the Assumption parish.  Close relationships have been established and maintained between parish and school and in the decision making regarding facilities, finance, and many joint activities throughout the years. ​The Our Lady of the Assumption Finance Council oversees and monitors all financial operations of the school. Pastor Mike Montoya oversees and consults on all school activities and events, and is the final arbiter​ in any conflicts and disputes. ​