Pattern of worship Question

I had a thoughtful question about one of the first assignments on the Pattern of Christian worship.

If you remember the question is:

1.     Put in your own words the pattern of worship described in the Book of Worship for a service of word and table. Briefly relate how this pattern came about and why this pattern is important to keep in mind as you plan and lead worship in your church today. Make sure you include descriptions of the physical movements that are described in the rubrics, i.e. the pastor’s hands during communion, choir, liturgist, etc. (Feel free to pull on White and Hickman as well)

     There was some confusion as to what I was asking for.  Here's what I replied with:

What I want you to do is walk me through the four movements of worship outlined in the word and table liturgy.  Show me that you understand a bit about why we do what we do with this pattern and where it comes from.  I'm also interested in movement:  both liturgically and literally.  Does the choir process in, does the pastor face the congregation or the cross when offering the elements, why raise your hands when doing the great thanksgiving, etc.  I'm not looking for something comprehensive, I'm not looking for you to rewrite the service.  I just want you to show me that you've thought through the historic Christian pattern of worship and are paying attention to the kind of movement that is intended in that service.

    My concern in asking you all this question is that most folks, and quite a few pastors, don't know why we do what we do in worship and therefore feel free to rearrange things willy-nilly.  And yet there are some solid reasons why the entrance/gathering is important beyond 'warming people up' for the sermon.  I want you to show me that you've read the material and have begun to think about the larger patterns and movements that define Christian worship.  However you get at that is fine with me.

   Sorry I wasn't more clear with this.