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In 2009, I invited Aaron Swartz to contribute a "synthesis lecture"-essentially a short online book-to a new series I was editing on Web Engineering. Aaron produced a draft of about 40 pages, which is the document you see here. This was a "first version" to be extended later. Unfortunately, and much to my regret, that never happened. The version produced by Aaron was not intended to be the finished product. He wrote this relatively quickly, and sent it to us for comments. I sent him a shortdoi:10.2200/s00481ed1v01y201302wbe005 fatcat:volggayfqbepbaq6nskob3jypm