You'll get a technical project manager, and they'll bring in a consultant to do some programming.
"All you guys need to do is write a little code to interface X with Y, it should only take you a couple days"
They don't think, "you'll need to get with this vendor, use this outdated software, follow these restrictions, make sure the UI matches up with the other program, interface with this authentication library..."
That's all part of "Add UPS shipping support to our CRM software"