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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