[Trajan]

I don't think that research can really be thought of in a linear sense.

The two dimensional array's work nicely, though a three dimensional one would be better.

I think I am visualizing it as there being some way to advance through one research matix then make an advance in a particular area that suddenly jumped you to a different level of the matrix where the recent dramatic discovery would have an effect on all further research no matter the direction you take. Could you revert back to the original research matrix? I am not sure. I think that if you found a cheaper/better/faster way to propel your ships, not through better implementation of a know field of advancment, but rather through a never-before imagined breakthrough technology you would leave the old way behind and jump on the new technology.

for ex. If you spent 100 years developing transportation based on steam engine technology, then suddenly split the atom and found that you could make anti-matter propulsion a reality, why would you go back to steam engines in your ships.

---I am just brainstorming here, but hey...it is Firday afternoon in the States, and I am stuck at my desk with little motivation to work.

Cheers!
Trajan