I prepare material for training workshops I'm looking for guidelines for how much should I charge/get if I prepare the content and someone else gives the material as a trainer repeated times. For example, if we agreed that I take 50%, I'm looking for guidelines for how much I should take the second time he/she gives the material even if I did nothing the second time. I need neutral ways to decide job offers (especially free-lance work) such as "last offer arbitration". Please recommend individuals/ institutions who can work as third party mediators/arbitrators to settle how much each side should take in job agreements?