The crucial idea of Simon Chan's Liturgical Theology is that we must understand worship in the light of Ecclesiology. And the ecclesiology itself must be seen in relation to the creation. By this, he argues that the church is ontologically created before the creation. The church precedes creation in that it is what God has in view from all eternity and creation is the means by which God fulfills his eternal purpose in time. If this is so, then worship in the church must continue the action of the Triune God. Otherwise, it will fall short of the glory of God. From this brilliant standpoint, he implements it in the liturgy, cathecumenate, and so on.The last comment is, read it and it will give you many inspirations, and correction as well.