Abstract
In the near future Data Bank Users will be made of wide range of people and its applications will be much more diverse and more widespread. These users must be provided with a much higher level of abstraction compared to the current data models. Data modeling should be much simpler so that the end users can fulfill their information needs or apply the changes without needing experts and only with a concise training. The current data models are not suitable for the unskilled users. The first three initial parts will provide brief and comparative description of these data models and advantages and disadvantages of them. In the fourth part, the structure of Gravitational Data Model (which is made of bilateral connections between each entity and its dependents and also the other entities) and its pros and cons will be presented.
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