In answer to your reply that if they moved to Dublin "you can research them here" what you have written makes little sense when their placement in Dublin is in doubt. It is greatly appreciated that you will share your knowledge of the National Archives, but it must be remembered that just looking at the raw data that you would start with will usually give any insight as to what you might be looking for.
For example, say you have the name of the individual but little else, other than they might have moved to Dublin. Even in 1911 Dublin was a big city. You are looking for a Catherine, or maybe Kitty, and you have nothing more to add. You wade through nearly 1,000 entries (i.e., 9 pages of 100) and unless this Catherine has no other "competition" what you have is a listing of Catherine's. Perhaps you can reduce that by the age. Maybe you can reduce it by "Head of Household." And maybe you can reduce it by eliminating all others not of that religion.
Catherine was a popular name.
You still have the possibility that the census taker missed your Catherine. Like in looking for the Cody and Coady people in Tyrone.
But thank you for your input as it all helps in finding the illusive ancestors.
jjc
