Here we will address few primary design considerations regarding logical layers. This is not mandatory that we need to build each and every system in popular “Three Layer” model. There might be a design context where single or two layer approaches can be a good design choice. Here we need to clarify the layered division and their responsibilities. Here we can also address some present and future possible considerations, supporting the current division of layers, such as, regarding multiple UI (Windows forms, Web Form), data source (SQL Server, XML, Oracle etc) platforms etc.
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