Personally, I find the historical approach best for familiarizing with a certain computer-related technology. Getting to know the evolution of Flash and Flex will not only give you some background behind the design decisions in these technologies, but it will also embed in you some kind of intuition for the technological limits of the current state of affair and some sense of what’s coming in near future.
Beside the history of Flash and Flex, you’ll also learn about the Flash Platform. It’s pretty strange that Adobe don’t have something more detailed than the diagram you can find in the Platform at a Glance, but as I write these lines I’m looking at a pretty cool diagram of the platform that I’ve found in this article:
The above diagram covers everything in my more detailed diagram about the whole Flash eco-system, and as you can observe the above diagram is somewhat more beautiful. Actually my diagram was taken from the white board scribbling of Ely Greenfield while he was giving an interview to Robert Scoble almost two years ago when the Flex Framework was first announced to be released as open source.

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