Silver plattering is a made up verb that refers to giving to the customer more that what is in the scope of the agreement. Basically, you give them your work for free while smiling, you give them what they want in a silver platter.
As any good negotiator might tell you, it can be a good deal if by giving a little you get something else, but it can be the doom of a project if the silver platter starts and never ends. When working in projects, be aware of the risk of silver plattering. I sank a 7 year old company just because I was not paying attention to it. Believe me, its a high risk.
The expectation that the contractor change indefinitely a software is quite common in organisations that don't have mature processes and don't have a clear understanding of software development practices. It basically describes most organisations working in a undeveloped software market, Colombia for example.
For example, they want the software to fit the process, but they keep changing the process and expect you to develop the change again and again. One that is happening to me right now is that the requirements are given to you with little or no details, for example lacking special cases or precise data that needs to be saved. Then, when the testing starts you are expected to change it again and again for not being a good psych and developed exactly what the customer had in mind but forgot to write down.
What to do? Its as clear as water. Don't give your work for free, no matter what happens. It you loose a client because of it, it might be better for you. First, be sure to include in the contract a clear definition of change and defect. Second, include in you plan a specific milestone for client approval of the requirements and don't start development until you have a valid signature. Then, stick to your process like a fly to honey.
When asked to do a new change because its the "last one", just say no!
