but also moving beyond in accommodating them". Liturgy The CSI Synod Liturgical Congress has developed several new orders for worship for different occasions. The order for the Communion service, known as the CSI Liturgy, has been internationally acclaimed as an important model for new liturgies. The committee has also produced three different cycles of lectionaries for daily Bible readings and "propers", and collects for Communion services. In addition, the committee has also brought out a supplement to the Book of Common Worship. Cherishing the reformation principle of worship in the native language, the CSI liturgy and church services are completely in the vernacular, in all the different South Indian states and Northern Sri Lanka, which comprise its ecclesiastical province. Observances and festivals The important observances and festivals include Lent (including its first day, Ash Wednesday), Passion Week, Palm Sunday, Maundy Thursday, Good Friday, Easter, Ascension Thursday, Pentecost, Lammas and Christmas. Constitution The Constitution of the CSI is the key document that governs the administration and management of the church. It comprises 14 chapters detailing rules for the functioning of the Church at every level, from local congregations to the pastorate, dioceses and the Synod. The most important part of the CSI Constitution is "The Governing Principles of the Church" which sets out 21 governing principles on which the other chapters of the Constitution and the rules contained therein rest. While amending any part of the Constitution can be approved by a two-thirds majority of the Synod, amending the Governing Principles requires a three-fourths majority. Ecumenism As a united Protestant Church, the Church of South Indian is a member of the World Methodist Council, as well as the World Communion of Reformed Churches; as a constituent member of the Anglican Communion and its bishops participate in the Lambeth Conferences. It also has representation in the Anglican Consultative Council. Consequently, the CSI is in full communion with the Old Catholic Churches of the Union of Utrecht and the Philippine Independent Catholic Church. It is a member of the World Council of Churches, the World Alliance of Reformed Churches, Christian Conference of Asia and the National Council of Churches in India. Through the Communion of Churches in India, it is also in partnership and full communion with the Church of North India and the Mar Thoma Syrian Church. The Church of South India maintains close partnerships with the Church of Scotland, Episcopal Church