This document discusses the software development life cycle (SDLC) and different software process models. It describes the SDLC as a sequence of steps from planning to maintenance that helps create high quality software on time. The main phases of the SDLC are planning, requirements analysis, design, implementation, testing, and deployment/maintenance. It then explains the purpose of the SDLC and different software process models, including linear sequential, prototyping, and evolutionary models. For each model it provides an overview of the typical process and when each model is best applied.

1. Sushama A. Deshmukh
ME Computer Science and Engg.
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2. Introduction to Software Development Life
Cycle and Basic Software Process Models
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3. The Software Development Life Cycle (SDLC)
and Software Process Models
• Objective:
- To understand Software Development Process
- To know the types of Fundamental Software Process Models
- To know when to apply the types of software process model
• Introduction:
- The SDLC
- Purpose of SDLC
- Stages of SDLC
- Software Process Models
- Working of Fundamental Software Process Models
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4. The Software Development Life Cycle (SDLC)
• SDLC is a hypothetical structure which explains all
process activities in a software development with its stages
and tasks involved in each step from planning to completion
of support and maintenance.
• For developing a software product , it is important to
go through a sequence of steps like a road map that helps
you create a timely, high quality result.
• The road map that developers follow is called a
“ software process”.
• SDLC has following fundamental software process
activities as shown in figure.
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5. Phases In SDLC
Communication
(System
Engineering.)
Deployment &
Support,
Maintenance
Requirement
Analysis
Design
Coding
Implementation/
Coding
Testing
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6. Purpose of SDLC:
Quality
Software
Customer
Satisfaction
Efficiency
Within
Budget
Delivery
Deadline
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7. Purpose of SDLC:
• To produce a quality software.
• To deliver the software in timeline/deadline given by the
customer.
• Software should be developed within the budget mentioned
by customer.
• And the most important is customer’s satisfaction about
requirement fulfillment.
• SDLC gives the step by step, disciplined and measurable
approach for developing good quality software.
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8. The Stages of SDLC?
Deliverables at Each PhaseSDLC Phases
planning about resources, product,
and processes.
Testing
Implementation
(Coding)
Design
Planning
Requirement
Analysis
Maintenance
(SRS) Software Requirement
Specification.
Details about- Software Architecture, Data
Structure, Interface and Procedure or
Algorithm details .
Design is translated into machine
readable form.
Remove the errors, and to check for
its validity about requirement.
Correcting errors, improving for
correctness, installation , deployment.
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9. Software Process Models
• To solve actual problems in an industry setting, a software
engineer or a team of engineers must incorporate a
development strategy that encompasses the process,
methods, and tools layers .
• A process model for software engineering is chosen based
on –
• The nature of the project and application,
• the methods and tools to be used, and
• the controls and deliverables that are required.
In an intriguing paper on the nature of the software process, L. B. S. Raccoon [RAC95] uses fractals
as the basis for a discussion of the true nature of the software process.
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10. Fundamental Software Process Models
Software process models follows the framework of SDLC.
Software Process Models (SPM) has three main
categories those are as follows:
1. Linear Sequential Model
2. Prototyping Model
3. Evolutionary Model
These all types of models follow the common
approach of SDLC with slight difference in their execution
process.
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11. Working of Linear Sequential Model
• This model follows sequential and step by step
approach of SDLC.
• This model is also called as Waterfall Model,
Classical Life Cycle model.
• Most specifically this model is used for small project
where requirements are fixed.
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12. System
Engineering
Requirement
Analysis
Design
Coding
Testing
Deployment
User
Requirements
SRS
Working of Linear Sequential Model
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13. • A prototyping approach is the best suitable to use in
situations such as –
– users requirements like detailed input, processing and
output are not complete
– developers don’t have clear idea about efficiency of
algorithm, the adaptability of an operating system or the
form that human or machine interaction should take,
technical issues are not clear.
Working of Prototyping Model
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14. Listen to
customer
Build/
Mock-up
Customer
test drives
mock-up
Requirement Analysis
Quick Design
Prototype
(Implementation)
Testing
Deliver final product
Working of Prototyping Model
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15. Working of Prototyping Model
• It follows SDLC with “quick design” approach,
which focuses on representation of those aspects of the
software that will be visible to the customer or user. A
quick design leads to the construction of a prototype.
• Prototype is reviewed by customer and used to refine
by developers by considering suggestions and
recommendations of the customer.
• The process continues in the iterative manner until all
the user requirements are met or satisfied.
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16. • The evolutionary approach is suitable for large problems
which can be decomposed into a set of modules for
increment development and delivery.
• Evolutionary models are iterative; using which software
engineer can develop increasingly more complete
versions of the software.
• This model is mostly suitable for large budget and no
time limit kind of projects.
• Types of evolutionary process model:
1. The Incremental Model
2. The Spiral Model
3. The WIN WIN Spiral Model
4. The concurrent Development Model
Working of Evolutionary Process Model
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17. Concept
Development
Working of Evolutionary Process Model
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18. Thank You.
Sushama A. Deshmukh
ME Computer Science and Engineering.
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