[mescalito]

I agree with pretty much everything and I also advocate for that. However, how do you invoice your clients? Its hard to say: hey I'll charge X for each two weeks increment. Client: Great, how many increments will there be? Me: dunno, we'll figure it out somewhere down the increments.

The agile approach is the way to manage projects, but how do you quote them?

[regularfry]

In theory, it ought to be "we can't tell you how many increments there will be because you'll have working software in your hands every two weeks, and we don't know enough now to say when you'll ask us to stop. It should be clear whether we are on track after the first 2 or 3, but you can pull out at any time after the first with a usable product." The whole premise is to get the client to buy into a subscription, rather than a single deliverable.

[raarts]

Not easy for clients to pick a supplier this way.

[regularfry]

Makes it easy to pick clients, though.

[erkkie]

Usually just by that, in increments. It helps to time-box something early into a new client relationship and once you're delivering proven value, clients tend to be fine with just incremental delivery and billing.

[Swizec]

Based on value.

[BoiledCabbage]

You still need to know how much it'll cost you. If you can't estimate how long it'll take, you may spend more in paying employees than it pay for the project.

[nightski]

Any client worth working for is going to have an annual budget and the focus won't be so much on how much things cost but rather how soon you can start delivering business value.