Time is compressing. Now it should be six days. Your voice mail is filling faster than you can empty it. Overnight vans are squashing pizza delivery trucks. All our problems today tend to fall between functional disciplines.
Combined expertise is, of course, diversity working together.
If you can locate a group of people who normally wouldn't even speak to one another, maintain decorum, and have fun, you will inevitably produce a breakthrough product. You have to combine technical understanding with negotiation and persuasion. You have to be as broad as you are deep. You have to become something akin to an orchestra conductor. You have to be a maestro.