Hi,

In my view measuring success on an agile project would be an ongoing thing throughout the project. The customer should be able to measure success of each iteration on the basis of business value delivered to him at the end of every iteration. This way he would be able to measure what he values success every iteration and fine tune it as and when required.

That being said as a customer I would be happy at the end of a project which was executed the agile way if

1. I got the business value that i envisioned from the project.
2. I was able to change course as per the business demands and get functionality delivered which makes more sense today.
3. I was able to give early feedback
4. I was able to prioritize the development of features/stories so that I got the right functionality at the right time
5. I was able to stop development before all the functionality was implemented because i realized that I got all the functionality that I wanted and rest of the functionality might never be used.
6. I trusted the development team and the trust relationship was vice versa
7. Impediments were raised frequently as and when they happened and I worked with the team to resolve them.
8. I got no surprises during the project.
9. I got peace of mind because every iteration gave me results and I knew i was in control.
10. I got value for money :)

Regards | Vikas