Does Zen distinguish between concentration and insight meditation?

Both the Theravada and Tibetan systems distinguish between two *aspects* of meditation -- **concentration** (aka shamata, serenity, calm abiding, shiney or zhiney (Tib.)) and **insight** (aka vipashyana, lhatong (Tib.)). (Some call them *types* of meditation, but I prefer *aspects*, since you need your concentration skill while doing insight work -- in fact, that is what concentration is for -- but you can at different times be aiming at one or the other.) The question -- does Zen make a similar distinction? I realize Zen is not monolithic, so answers for specific schools are fine.