Some friends of yours are working on an information system project. They are applying an agile methodology. They have decided not to develop a logical data model for their system. They told you that since they are using agile methodology, it made more sense to devote their time and intelligence to create "physical data model" as they are not going to throw it away soon after they finish it. Do you agree or disagree with their decision? Explain your position with reasons and examples from your own experience or reading.