I have seen scope change been an issue on 10k projects as well on multi-million dollar projects. All of which in my history would have been better off with an hourly billing.
The number of bodies were talking about makes a big difference, and the larger that number is the more a fixed rate person/week makes sense. Just like the larger consulting firms its all about placing a lot of people for a long time, +/- 1 week here or there won't matter. You mitigate the risk and it makes sense to take it on spread across the team and only as granular as weeks. Agreed your system works really well with those scenarios.
I interpreted the the original post was an individual who provides consulting service where 1 week could make a difference, 20% overage on a 1 month project. The companies aren't necessarily tiny, but maybe the departments within those companies (read budget) he consults with are limited. In this scenario I would favour a good hourly rate over fixed price every time.
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I have seen scope change been an issue on 10k projects as well on multi-million dollar projects. All of which in my history would have been better off with an hourly billing.
The number of bodies were talking about makes a big difference, and the larger that number is the more a fixed rate person/week makes sense. Just like the larger consulting firms its all about placing a lot of people for a long time, +/- 1 week here or there won't matter. You mitigate the risk and it makes sense to take it on spread across the team and only as granular as weeks. Agreed your system works really well with those scenarios.
I interpreted the the original post was an individual who provides consulting service where 1 week could make a difference, 20% overage on a 1 month project. The companies aren't necessarily tiny, but maybe the departments within those companies (read budget) he consults with are limited. In this scenario I would favour a good hourly rate over fixed price every time.