For me, the graph is correct as long as you assume the vertical scale is really low. I learned about 20 commands the first day I used vi, and I still only know about 20 commands - 10 years later.

Cannaerts, Jan wrote:
Wow, anyone that touches Vi is instantly proficient and insanely productive 
with it!

Similar in style, correctness, and entertainment value is the following (whose 
topic does not necessarily pertain to the list);
http://i.imgur.com/jj16ThL.jpg

I remember using it once to describe the learning curve associated with z/OS to 
college students getting ready to pick optionals.

_Jan

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