Matrix Organization in OA?

I am working on a site that needs to be organized as a matrix. Most articles need to be accessible under several search criteria. Most articles will fall under multiple groups/tags/etc:

Materials
Equipment
Process

Each of these broad categories will have 10-12 sub-categories, so that a given article may be relevant to:

Material #2
Equipment #7
Process #9

Is there a way to organize things in OA for this type of cross-reference or is OA the wrong tool? OA has so many good ideas that I may be trying to pound a square peg into a round hole. Perhaps a straight taxonomy approach would be better.

I would appreciate you advice.