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System development life cycle (SDLC)

Is the overall process of developing, implementing

and retiring information systems.

This process conduct through 5 phases .

1. Initiation or planning

2. Analysis

3. Implementation

4. Maintenance

5. Implementation


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WaterfallAdvantages of Waterfall Disadvantages of Waterfall

-Simple and easy to understand.

-Easy to manage due to the rigidity of the

model (specific deliverables and review of

processes is available in each phase) has

specific deliverables and a review process.

-Each phases is processed and completed one

at a time

-Works very effectively for smaller projects

where requirements are well understood.

-Working software is only produced late into

the life cycle process.

-Has a high amount of risks and uncertainty.

-Not suitable for long duration and ongoing

projects.

-Difficult to make changes in the design once

an application is in the testing stage.

-Does not work well for complex and object-

orientated projects.

SDLC is best used when developing a new version of an existing product and only when

the system requirements are very well known.


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Structured System Analysis and Design

Methodology (SSADM)

SSADM (Structured Systems Analysis & Design Method) is a widely-usedcomputer application development methodology that was first introduced inthe UK to carry out government computing projects.

Over the years this methodology was adapted by the public sectors ofEuropean countries around the world


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There are three techniques used in the SSADM methodology.

1. Logical Data Modeling

Entity Relationship Diagram


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2. Data Flow Modelling

Data Flow Diagram


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3. Entity Behavior Modeling

Entity Life History Diagram


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The SSADM methodology consists of five main steps. Each

step is a continuation from the previous step and every step

can be broken down further. The steps are:

1. Feasibility Studies

2. Requirement Analysis

3. Requirement Specifications

4. Logical System Specifications

5. Physical Design


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Advantages of SSADM Disadvantage of SSADM

-Respond to changes in the

business environment

- Effective use of skills

-Improves productivity

-Cost effective ( reduces cost)

-Produces better quality of

systems

-Can be time consuming due to

over analyzing

-Inconsistency in checking

-Outline diagram can become

very unclear sometimes because

all relevant data flows have to be

included.

In conclusion, the usage of SSADM in government projects had proven that SSADMhas the ability to increase the overall quality of the system in long-term situation


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OBJECT ORIENTED ANALYSIS

AND DESIGN

Uses classes, objects and attributes to describe a systemClasses and their relationships is the process of describing object-oriented analysisThree types of class relationships


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DESCRIPTION

Two main UML diagramsEg :Use Case Diagram


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Eg: Class Diagram


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Advantages and Disadvantages

Advantages Disadvantages

Real-World Modelling Insufficient OOAD training

Reduced Maintenance Abandonment of Traditional Design Processes

High Code Reusability Form and Substance

Improved Reliability Implications of OOAD


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METHODOLOGY CHOSEN

Object Oriented Analysis and Design

software engineering approach that models a system as a group ofinteracting objectselements and behavior are the objects that pointed to the entity in thesystem


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QUESTIONNAIRES

1. Are you satisfied with the current online gift2 u system?2. Would you prefer an online booking system which is available all yearlong?3. Have you experienced any problems in the current gift2u system?

4. Do you find it troublesome getting information about the productsover the phone?


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Use case diagram


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Class Diagram


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Home page of the gifts 2u website


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About us


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Customer registration


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User account activation


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Logged in interface


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Edit profile interface


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Product page


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Detailed product page


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My cart


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Checkout page


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Payment page


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Delivery status


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Administration page(Add new item)


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Administration page(edit or remove item)


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Top customer(view or edit info)


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Top products in Gifts2u


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