[datadrivenangel]

The research referenced in Fred Brook's The Mythical Man Month found that there was a 10x difference in programming task completion time between the FASTEST and the SLOWEST developers, but only a ~2.5x increase from the median to the fastest.

[mustardo]

This! I've worked with a few developers I would consider net negative to their team and product, in that their removal would have increased 3-4 other team members productivity by say 20% each. Coincidently these developers were almost exclusively Indian immigrants. In organisation with poor corporate culture and the ZIRP (Zero Interest Rate Policy) days of hiring to signal growth and managers hiring to increase the number of reports (to signal importance) compounded the problem