Keep in mind the article is about dealing with evasion. You seem to be assuming that "I don't know" is being seen as evasive, but it's really being assumed beca

Keep in mind the article is about dealing with evasion. You seem to be assuming that "I don't know" is being seen as evasive, but it's really being assumed because that's what the article is about. Also, depositions are by law conducted the same way testimony at a trial would be, so the lawyer can't herself testify–asking a whole lot of questions is mandatory. Are you saying you think the lawyer should say "The distance from you to me is about five feet. The distance to the wall is about fifteen feet. The distance to that building you see through the window is about eighty feet. How far away would you say <thing> was?" Because that seems unnecessary when an appropriate answer would be "I don't know how many feet, but about the distance to that wall."