Did anyone check out KollabNet's SolidMap, which was at SWW? It's the addin that gives you block diagrams showing relationships between parts and features. I'm nearly positive that we have designed in circular references, but we're either too lazy, too stupid, or in too much of a hurry to find them. (Naturally, I claim it is the latter.) Jerry Steiger Tripod Data Systems "take the garbage out, dear"