CASE Tools and SDLC: Concepts and Applications, Study notes of Computer Science

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Unit 2

Dr. Maharasan.K.S

Department of Computer Applications

KG CAS

SDLC

• The Software Development Life Cycle (SDLC) , or System Development Life Cycle in systems engineering, information systems and software engineering, is the entire process of formal, logical steps taken to develop a software product.
• The concept generally refers to computer or information systems.

SDLC

SDLC Phases:

• Problem Definition.
• Program Design.
• Coding.
• Debugging.
• Testing.
• Documentation.
• Maintenance.
• Extension and Redesign

 Problem definition is the basic and primary step of software development life cycle.  It includes the goal of system analysis and to determine where the problem is in an attempt to fix the system.  This step involves "breaking down" the system in different pieces to analyze the situation.  Requirements Gathering sometimes requires individuals/teams from client as well as service provider sides to get detailed and accurate requirements.

Problem Definition:

SDLC

• The design stage takes as its initial input the requirements identified in the approved requirements document.
• Design elements describe the desired software features in detail, and generally include functional hierarchy diagrams, screen layout diagrams, tables of business rules, business process diagrams, pseudo code, and a complete entity- relationship diagram with a full data dictionary.

Program Design

SDLC

Debugging  Debugging is the process of removing the errors that occurs during the coding part.  Debugging is essential for this stage establishes the platform for further stages of development.

Testing  The code is tested at various levels in software testing.  Unit, system and user acceptance testing’s are often performed.  This is a grey area as many different opinions exist as to what the stages of testing are and how much if any iteration occurs.

SDLC

• Documentation is the process of writing down every stages and each and every details of the process of life cycle development so that anyone who follows this process may be able to do it in the real sense.
• Documenting the internal design of software for the purpose of future maintenance and enhancement is done throughout development.

Documentation

SDLC

• This is the last step of system design where there is always scope for extension and redesign whenever required.
• This stage allows for the extension of any part for the advancement of the software or so that the developed software does not become useless.
• This stage allows further designing and following all the steps again.

Extension and Redesign

SDLC

 1.Waterfall Model  2.Software Prototyping  3.Joint Applications Design (JAD)  4.Rapid Application Development (RAD)  5.Extreme Programming (XP)  6.Prototyping and RAD.  7.Spiral Model  8.Agile Model  9.End-user development  and many more

Different types of SDLC models

SDLC

Pay Roll Processing System

Sample

Pay Roll Processing System

Sample

Pay Roll Processing System

Sample

Pay Roll Processing System

Sample