[EliRivers]

Each software development methodology seems to be about mitigating particular risks.

Agile seems to be mitigating the customer not knowing what they want the software to do; tiny little software cycles, little steps, making the customer look at it frequently and saying what they think.

There are software projects with high-quality customers (sadly so rare) for which that risk is much lower, and as such agile is a bad fit. There are certainly software projects where waterfall is a better fit, mitigating against different risks.