Differences between audio book and written book?

I followed Allen's audio books Getting Things Done Fast and after listening to the whole thing at least twice, it has changed my life and brought it to a new level of productivity I had never seen before in my life. I have pretty serious ADHD (predominantly inattentive type).

Is there any info in book that's not contained in the audio version? How do I take this to the next level after using the system and info taught in Getting Things Done Fast?
 
Not sure. I recommend you log on to your local library's website, and search for David Allen's books, then check them out at the library. All of them are useful, in different ways.

He's also planning to release a new book in December.
 
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