Fixed-price/scope/date and SCRUM
We use scrum (agile development) in our larger projects, and recognize this issue: clients demand a fixed price for a project which is based on a fixed scope and fixed date. According to an article in the Automatiserings Gids (Dutch), this is still possible with scrum by dividing the original scope in iterations, but it does have its limitations and challenges. It's not the preferred way, but it's way better than not using an agile approach. In the meantime, we try to convince clients and partners to consider scrum.