Is it true that GTD becomes mainstream Time Management approach?

David Allen's approach "Getting Things Done" (GTD) is very popular now, though is relatively young. Although in official definition of GTD it's author avoids using term "Time Management", we could consider GTD as one of the Time Management variations. Readers who are not new to Time Management, know that like Allen today, there were other famous names referred to Time Management in past, for example, Alan Lakein and Stephen Covey.

I made some research using Google Trends to determine how changes popularity of GTD with time and compared it with Time Management itself.

Next graph shows how fast GTD popularity grew from 2004 to mid-2008. Starting from his first book Getting things Done: the Art of Stress-Free Productivity published in 2001, David Allen managed to greatly improve success of his approach. And it is no surprise that search popularity of GTD grew rapidly.

But how GTD popularity is compared with Time Management itself? If you look at next graph you'll see some unexpected results: on the same period as GTD popularity grew, the Time Management popularity noticeably decreased!

How to interpret received results? The most simple and obvious interpretation stated at the caption: GTD becomes mainstream Time Management approach and even more - it step-by-step substitutes the wider philosophy with more narrow system. We can't say definitely is it good or bad, but what is absolutely clear is that GTD now is strong as never before.