Legal researchers always need to be aware of the possibility of change. Legislatures pass new statutes or amend existing ones, courts decide new cases, new social and technological developments create new legal issues. For generations, lawyers kept up with new cases by skimming the advance sheets of case reports and followed other developments by reading the newspaper. Those techniques are still useful, but changes in technology offer today's researchers many more tools for keeping up with new developments and staying current in one's area of specialization.
graphic: drawing of newspapers or magazines from British Library's photostream on Flickr
Researchers' needs for updating information vary by type of information needed as well as its depth and breadth. Even one law student or lawyer will have different needs depending on the reason he or she wants to get updates. Adjust your updating techniques to your needs.
Consider the following examples:
graphic:drawing of two terriers, from a children's book (Our Friends and All About Them, 1893), available in British Library's photostream on Flickr. It has nothing to do with researchers' needs for current information, but the dogs do look curious, don't they?