System Design Technique

Design is the creation of a plan or convention for the construction of an object or a system. Design is a road map or a strategic approach for someone to achieve a unique expectation. System Design is the process of defining the architecture, components, modules, interfaces, and data for a system to satisfy specified requirements.

The person who designs the system is known as System Designer.

The essential skills for a designer are:

1. understanding people’s needs
2. working visually and tangibly
3. prototyping to manage risk
4. working inclusively and collaboratively

System design is a process 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

The process of System Design includes the following steps:

1. Logical Design

The Logical Design of a system pertains to an abstract representation of the data flows, inputs and outputs of the system. This is often conducted via modelling, using an over-abstract (and sometimes graphical) model of the actual system. Logical designing describes the structure & characteristics or features, like output, input, files, database & procedures. Logical design includes ER Diagrams i.e. Entity Relationship Diagrams and DFD i.e. Data Flow Diagrams.

2. Physical Design

The physical design relates to the actual input and output processes of the system. This is laid down in terms of how data is input into a system, how it is verified/authenticated, how it is processed, and how it is displayed.

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