Building blocks, heros, and ensembles

I was searching on the internet the other day for story writing software. I was curious to learn what kind of software is out there for this purpose. I came across one application called John Truby's Blockbuster. There was a 15 day trial version available; I downloaded it in order to give it a spin. This fifteen day trial period will probably end before I've had a good look at it though.

This application is based on a model that uses 22 building blocks for developing a story. Building block #1 is Self-Revelation, Need, Desire. This is what the manual has to say about this building block:

The self-revelation, need, and desire represent the overall range of change of your hero in the story. They are the structural "journey" your hero will take. Therefore, it is important that you determine these elements first so that all other steps in the journey will lead you where you want to go.

I have been reluctant to identify a protagonist in Mission: Dawn because my vision for this story has been to create an ensemble cast. Must I have just one protagonist?

I looked up protagonist on wikipedia. It says In an ancient Greek drama, the protagonist was the leading actor and as such there could only be one protagonist in a play. Hmmm, okay, but Mission: Dawn is not an ancient Greek drama. I guess I need to do some more thinking about this.


Some articles I have found about story writing:
Protagonist - From Wikipedia, the free encyclopedia
How To Write A Novel - A Simple Procedure to Follow by Paul Saevig
A Novel Idea - First of a series of columns by John Ravenscroft as he writes his first novel, in public