Comment by epalm

I like this mentality, truly, makes perfect sense. Check in often to make sure you’re building the right thing. Keep going until it’s done.

However, the client is going to want to know (A) how much it’s going to cost, and (B) how long it’s going to take. These are extremely reasonable questions in most cases/industries. To answer these questions with a shrug is a nonstarter. The client is working with a time budget and a financial budget, and they need to have some sense of the numbers.

If the Waterfall and Agile methods are opposite ends of a spectrum, somewhere in between is where I’ve found an acceptable middle ground for both developers and clients.