steps in system design

Design Objectives: System design is to deliver the requirements as specified in the feasibility report. The main objectives of the design are

1. Practicality
2. Efficiency
3. Cost
4. Flexibility
5. Security

System design contains Logical Design & Physical Designing, logical designing describes the structure & characteristics or features, like output, input, files, database & procedures. The physical design, which follows the logical design, actual software & a working system. There will be constraints like Hardware, Software, Cost, Time & Interfaces.

The processing techniques are

Ø Batch Processing 
Ø Real-time 
Ø Online 
Ø Combination of all

Structured design is a data flow methodology. The graphical representation of data flow, communication & defining the modules & their relationship with each is known as Structure Chart. This method decomposes & modularizes the system so that the complexity & manageability will come down. Thus reducing the intuitive reasoning & promotes the maintainable provable systems.

This type of design follows top-down & hierarchy, which will have one single entry & single exit, The advantages of this method are

1. Critical interfaces are tested first
2. Early versions of the design, through incomplete are useful enough to resemble the real system
3. Structuring provides control & improve morale
4. The procedural characteristics define the order that determines processing. 

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