From time to time you might see a "not set" entry in your Top Content or Keywords reports. Hopefully at this point you go to the Google Analytics Help Center  to do a search for "not set" to find the definition. :) If you don't, not to worry - this blog post sums up why this entry appears in your report and what you can do to prevent it from happening in the future."not set" Re-tagging your AdWords destination URLs URL Builder  to tag your destination URLs so that they're set to the specific campaign variables you want to appear in your reports.gclid  redirection for keywordsgclid  (which is the magic that makes autotagging  happen) doesn't work the way it's supposed to. At this point, we recommend you do some detective work going backwards from what you know. Start by clicking on the "not set" entry, and from the Dimension menu, select 'Source' and then 'Medium.' You can also select 'Landing Page' in the Dimension menu if 'Source' or 'Medium' doesn't give you any clues about the missing keyword. These segmenting options should help you narrow down the source of this keyword so that you can pinpoint which keyword's gclid  isn't behaving properly.Posted by Christina Park, Google Analytics Team