So, how many intelligent people do you need to change a lightbulb?
It's the same as the answer to my own lightbulb joke:
Q. How many lightbulbs does it take to change a lightbulb?
You only need one person to do a one-man job, especially if they're of average or above intelligence.
Now how about this. How many intelligent people operating under an enterprise-wide process does it take to change a lightbulb? The answer is, it can't be done.
Sadly, the presence of a process often means people are not empowered to act and feel disinclined to think. Clearly having no process is bad, but having a poorly understood, or an overblown process is a sure-fire route to nothing happening.
Edison wasn't following a process, thankfully.