To set some things straight. I have got experience with scrum and I know how the planning process goes in a Scrum project.

The question I have relates to the start of a project. Let's say I as a PM or Scrum master get a document from a client where it says roughtly what he wants. 

* An online platform
* Some information what the website is about (lacking many details)
* Various couplings (of which the description is ambigous)
* And some deadlines.

Now the client wants a price quote. Now the question is how to go about this. 

* The customer wants his product on Time
* We both don't want to have disagreements about the delivered work.
* Was it promised or not. The customer wants a price quote while the specs are not clear yet

I would like to know how others deal with this problem.