It has been pointed out to me that in my tweetminster interview, see yesterday’s blog for the reference. I missed some of the most dangerous consequences of putting public sector data on-line and inviting the public to correct it. Sir Humphrey can, however, fight his own battles. Instead I would like to remind you of what Sean Barker said in his guest blog earlier this year on the need to pay more attention to old-fashioned data standards and be less dazzled by clever mash-up tools. Common Data Standards are essential to making sense of the data that is put on-line, they are also central to realising the theoretical savings from shared systems. Without them we can spend the next decade arguing what the data means, let alone whose data is “correct”.