ICT in Education/Student Activities/Mr. Tak Kean/Class M3/Group2/Group Activity/System Design


 * Hor Norin >>

System Design
Hor Norin >> What is "System Design"? And what step that involve in "System Design"?

Well "System Design" is the process of defining the architecture, components, modules, interface, and data for a system to satisfy specified requirements. The step that involve in "System Design" is to determines "Architectural Design", "Logical Design" and "Physical Design".

Architectural Design
Logically speaking architectural design of a system emphasizes on the design of the system that describes the structure and behavior of the system.

Logical Design
Logical Design focus on the representation of the data flows, input and output of the system. Usually involves in modelling the actual system in the context of system included ER Diagram and so on.

Physical Design
Physical Design takes the above two steps into account and take it a step further by    implements both steps, add the hardware requirements and user interface and verify the process of the system if it behaves correctly according to business rules.


 * He Rotha >> reply to Hor Norin : "Thanks, Hor Norin. Your description is important for me to present. I will take some into my presentation. Well done, Hor Norin ."


 * He Rotha >> The purpose of System Design

The purpose of systems design is to answer the question: “How will the information system solve a problem?”

Systems Design phase is a technical design that details system outputs, inputs, and user interfaces; specifies hardware, software, databases, telecommunications, personnel, and procedures; and shows how these components are related.

There are two keys for System Design: 1. Logical Design The logical design refers to what the system will do. It describes the functional requirements of a system. 2. Physical Design refers to how the tasks are accomplished, including how the components work together and what each component does.


 * He Rotha >> Well all member. You can see in detail about System Design on this link: http://www.laynetworks.com/cs05_SAD_4a.htm


 * He Rotha >> This is our slide presentation system design.pptx. if anyone has comment, please comment now.

==> System Design
 *  Hak samdara >>

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

- Batch Processing , - Real-time , - Online , - 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.
 * He Rotha >> This is the last update of our slide presentation system design.pptx