How a Teaser Trailer is made

How is a Teaser Trailer Made from Alice Kelly

I have created a PowerPoint Presentation and uploaded it to Slideshare telling my audience about how a teaser trailer is made. I was looking to find out what roles there was within the creation of the teaser trailer but I couldn't find the information so I left it out. Hopefully as I find out more about teaser trailers I see what roles there is within the process of making a teaser trailer and upload it to my blog.