The physical data model should represent exactly the way the tables and columns are designed in the in the database management system.  I recommend keeping storage, partitioning, indexing and other physical characteristics in the data model if at all possible.  This will make upkeep and comparison with the development, test

I have a question --- do we need a logical data model for a conversion?  Here are my thoughts.  I believe the answer is yes if the conversion has any of the following characteristics: The target application is created in-house. This application will more than likely be enhanced in the