Hi Josette, I've found doing the 37 marker YDNA (after years of research) to be extremely valuable in establishing a link to two other descendants from the I (Nordic) Carsons. Fortunately, these were exact matches (so far). It is helping to narrow down the locations to research. It also eliminated some other Carson lines as being biologically closely related even though some were in the same areas. I've found that doing the YDNA is like having a telephone. A telephone is useless unless enough other people have one to make a connection. The same goes for the YDNA. The more that do it, the more possible links. I'm still researching regardless. Gary