QuoteHuffam says that they set out to examine the Alien mythology and isolate what makes this movies tick in the first place. The result was an 8-10 page document which laid out the rules of the Alien universe
It doesn't sound like a chronological account of
Alien movies events to me, they were more interested in gleaning out the elements helping these films to impress the audience. So, considering the nature of the film their Rule book may look like - in a very slight approximation - 'three jumps here, two screams there, Alien's mug up-close, swift scrambling in the background with a splash of blood'.
It also feels like an internal, filmmakers' eyes only document, nevertheless, it would make a generous gift to all of us if they publish it on Alien Universe website on April 26 :-)