system design by neeraj bhandari (surkhet nepal)
DESCRIPTION
SYSTEM DESIGNTRANSCRIPT
SYSTEM DESIGN
Prepared By :
Neeraj Bhandari
Subir Thapa
Shreeansh Budathoki
Bivek Yadav
Kunal Gaur
SYSTEM DESIGN
System Analysis Describes What A System Should To Do
To Meet The Information Need Of The User. System
Design Specifies How The System Will Accomplish This
Objective.
System Design Consists Of Design Activities
• That Produce System Specifications
• Satisfying The Functional Requirements
• Developed In The Systems Analysis Stage.
System Design Consists Of Both Logical Design And Physical Design Activities1. Physical System Design 2. Architectural Design 3. Logical System Design
1.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 As In Physical Design.
2. Architectural Design
The Architectural Design Of A System Emphasizes On The Design Of
The Systems Architecture Which Describes
The Structure, Behaviour, And More Views Of That System.
3.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.
In The Context Of Systems Design Are Included. Logical Design Includes ER Diagrams I.E. Entity Relationship Diagrams.
Objectives
Describe The Strategic Planning Process, And Why It Is Important
To IT Managers
Explain The Reasons For Information Systems Projects And The
Factors That Affect Such Projects
Describe The Initial Review Of Systems Requests And The Role Of
The Systems Review Committee
Describe The Internal And External Factors That Affect Information
Systems Projects
Define Operational Feasibility, Technical Feasibility, And Economic
Feasibility
Describe The Steps And End Product Of A Preliminary Investigation
User Interface Design
Focuses On Designing The Interactions Between End Users And Computer Systems.
Designers Concentrate On - Input/ Output Methods And - The Conversion Of Data And Information Between Human-readable And Machine-readable Forms.
This Is A Proto Typing Process Where Working Models Or Prototypes Of User Interface Methods Are Designed And Modified With Feedback From The End Users.
Data Design Focuses On
-The Design Of The Structure Of Databases And
-Files To Be Used By A Proposed Information System. Data Design Frequently Produces A Data Dictionary,
Which Catalogues Detailed Descriptions Of:
• The Attributes Of The Entities About Which The Proposed Information System Needs To Maintain Information.
• The Relationships These Entities Have With Each Other.
• The Specific Data Elements(databases, Files, Record, Etc..) That Need To Be Maintained For Each Activity.
• The Integrity Rules That Govern How Each Data Appears
Process Design
Focuses On The Development Of Software Resources, (The Programs, Procedures) Needed By The Proposed Information System.
Process Design Produces Detailed Program Specifications And Procedures Needed To Meet
-The User Interface And Data Design Specifications That Are Developed.
-Meet The Functional Control And Performance Requirements Developed In The Analysis Stage.
System Specification
• Final Design Must Specify What Types Of Hardware Resources, Network Resources, And People Resources Will Be Needed.
• It Must Specify How Such Resources Will Convert Data Resources Into Information Products.
• These Specifications Are The Final Product Of The Systems Design Stage Called System Specifications.
Characteristics To Be Included In System Specification
User Interface Specifications
Content, Format, Sequence Of User Interface Products And Methods.
Database Specifications
Content, Structure, Distribution, Maintenance, Retention Of Databases.
Software Specifications
The Required Software Package Of The Proposed System
Hardware Specifications
The Physical And Performance Characteristics Of The Equipment's And Networks.
Personnel Specifications
Job Descriptions Of Persons Who Will Operate The System.
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