Hi Valentin, For projects that are fairly open-ended, you can provide a fixed quote that takes into account enough buffer to ensure you are safe. The downside is that could mean losing the opportunity due to having a price that's not competitive. However, that's better than risking your business...
Hi Valentin, Have you considered splitting the research phase and the development phase? You can quote a fixed amount for the research phase (I'm sure you can estimate this in weeks and take the hit if you go over). You can say to the client that you will quote the development once the research ...