Thanks to an article by Danny O’ Brien writing in the Irish Times for pointing out the origins and core principles of Agile Development. The principles were laid out by 17 developers in 2001 and are listed below, more information about Agile development is available here: http://agilemanifesto.org/
a generalist, someone who can create a non-trivial application by themselves. People who develop broad skills also tend to develop a good mental model of how different layers of a system behave. This turns out to be especially valuable for performance & optimization work. No one can know everything about everything, but you should be able to visualize what happens up and down the stack as an application does its thing.
4. What is a singleton?
A) class that is instantiated exactly once, producing just one object of that class
B) complete program that takes up only one line of code
C) data structure, such as a linked list, that contains only one member
D) The typical programmer on a Friday night