I can't give you a technical term related to that, but it's starting to look at any synergistic effects or any additive effects, or it could be not additive effects but subtractive effects—that's not quite the right word. It's looking at whether there is any interaction between these two substances, if you need to look at the impact of one and the addition of another. So it's looking at them together, rather than as individual substances, and how they interact.
On May 3rd, 2007. See this statement in context.