>* Junior developer - Will not produce much business value if left alone, and may produce nothing at all. Requires supervision.

This is what people here like to believe. But I don't think it is really true. A kid straight out of college can generate immediate business value if he/she can set up an online shopping cart in Php to give a business an online presence. I am pretty sure that the same kid can code up any business requirement of most of the local organisations that does not need to scale much or work with great reliability.

Also, it is not true that a junior dev requires supervision. Anyone with sufficient motivation and an internet connection can figure stuff out by themselves. I mean, they can get things done, even if in a fantastically stupid fashion.