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DFD's of Proposed system and Explanation

After analyzing the three businesses that gave us information on them
and after observing and conduction interviews with
managers and staff when possible, we have developed a proposed system,
basically we have kept most of the entities,
flows and processes but have extending it to a great extent in Level 2 Data Flow Diagram.
The proposed system is divided into three parts in this web site.
Level 0 and its explanation, Level 1 and its explanation, and Level 2 and its explanation.

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