Hi
here what I did:
just put fields in stage 1 ,2, 3 (for instance) and set the form configuration to 3 stages
then put submit buttons in stage 1 and 2 so that they trigger the 1->2 and 2->3 stage transition.
as for the rights, just allowed the public (if it is a front end form for non registered users) to create and modify contents
My only concern is about the email notification email field I regulary use in forms but for a multi stages form I can't put #fieldname# in the message if fieldname belongs to a stage prior to the email field stage.
it seems the email field only knows the fields in its current stage. SO it seems impossible to send a detailed message at the final stage with all the details of the previous stages
BEWARE: don't forget to set the emaul field notification method to ALWAYS if the email field is not at the first stage
thanks
cyril