From http://www.vertabase.com/blog/picking-a-project-management-methodology/

Agile process:

*Make an initial feature list *Get time estimates on each feature *Prioritize the list *Time box the development effort *Build and test as much as possible in that time *Launch *Get user feedback *Iterate

This works great for a tightly defined set of deliverables and a client who has done software before.

It is not good situations where the client requires a more turnkey solution provider. For example in a case where they are new to technology. Or, where they have a great idea, an understanding of their target users and the enthusiasm to stick with the project but are looking to you to provide consulting and execution.