System design is the main subfield of computer science and software engineering, and it is very relevant to emerging software developers. However, for many students, the theoretical study behind it is never fun, and most students who study this course cannot achieve the grades they want because of the complex nature of various ideas on this subject.
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What is system design
System Design refers to the entire process of designing, developing and maintaining computer-based information systems in an organization. System designers define architecture, modules, interfaces, and data for a system to meet certain requirements.
There are two steps of system design:
- General design
- structured/detailed design
General design
At this point, the new system specifies its features. The costs of implementing these features and the benefits of it are calculated. If the project is still considered feasible, we move on to the detailed design phase
Detailed design
At this stage, computer-oriented work starts sincerely and the design of the system becomes more structured. Structural design is a blueprint for a computer system solution for a problem that has similar components of computer applications and the correlation between the same elements of the original problem.
Input, output, databases, forms, codification schemes and processing features are prepared in detail. During the design phase, the programming language and the hardware and software platform running the new system are determined.
Many tools and technologies are used to describe the design of the system. These tools and technologies are:
- Flowchart
- Data flow diagram (DFD)
- Data dictionary
- Structured English
- Decision table
- Decision tree
The system design involves:
- Defines the required system output.
- Determines the data required to produce put.
- Determines the medium and format of files and databases.
- Processing introduces processing methods and the use of software to produce put.
- Determine the methods of data capture and data input.
- Designing input forms.
- Designing codification schemes.
- Detailed manual procedures.
- Documenting the design.
Types of system designs
Logical Design
Logical design is related to the abstract representation of data flow, inputs and system outputs. It describes inputs (sources), outputs(destinations), databases (data stores), and procedures (data flows) in a format that meets user needs.
When preparing a system logical design, the system analyst specifies user requirements at a detailed level that determines the result of the flow of information to and from the system. Data flow diagram, E-R diagram modeling is used.
Physical Design
The actual input of the physical design system is associated with output processes. It focuses on how data is accessed into a system, verified, processed, and displayed as outputs.
It builds a working system by defining a design specification that specifies exactly what the candidate system is doing. It is related to user interface design, process design and data design.
It contains the following steps:
- Specifies the input/output media, designs the database, and specifies the backup procedures.
- Implementation of planning system.
- Formulate a test and implementation plan and specify any new hardware and software.
- Updates costs, benefits, conversion rates, and system limitations.
Architectural Design
It is also known as high-level design that focuses on the design of the system architecture. It describes the structure and nature of the system. It defines the structure and relationship between the various modules of the system development process.
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