Logical design describes the components of an information system and their relationship to each other as they would appear to users. It shows what the system solution will be but not how it will actually be implemented. Physical design translates the abstract logical model into the specific technical design for the system. Name and describe the three stages of testing for an information system. Testing is critical to the success of a system because it is the only way to ascertain whether the system will produce the right results.
Conversion is the process of changing from the old system to the new one.
A detailed conversion plan is essential to insure that all aspects of conversion are treated properly and validated. They include data conversion, procedure conversion and training. Programming translates the design specification into software, thus providing the actual instructions for the computer. Programming constitutes a smaller portion of the systems development cycle than design and perhaps testing activities. Production is the operation of the system once it has been installed and conversion is complete.