Some think (initially) that Genetic testing should be an exact science of what is, and so will exactly tell you who to and how you are related. In reality, genetic testing just gives additional, often vague clues which must be used with other information to come up with hypothesis' of the probable relationships. Trying to figure out the relationship without traditional genealogy is like trying to do a Jigsaw puzzle with only the backs of the pieces showing. Pieces may fit, but when you turn the puzzle over you see how dramatically off you are. Further, a pretty strong analogy between genetic genealogy triangulation and GPS-based location determination can be made. And is given to encourage all to get as many, more distant relatives tested to assist the process of breaking through brick walls.