This document provides an overview of the Software Development Life Cycle (SDLC) and different SDLC models, including Waterfall, Incremental, Agile, and Spiral models. It describes the key phases and characteristics of each model, and discusses their advantages and disadvantages. The Waterfall model is a simple linear sequential approach, while Incremental is divided into modules with each release adding functionality. Agile uses rapid iterative cycles for continuous delivery, and Spiral emphasizes risk analysis with repeated planning, risk analysis, engineering and evaluation phases. Understanding SDLC helps improve quality, productivity and reduces risks of going over budget or delivering late.

2. Disclaimer: This presentation is prepared by trainees of
baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt .
Ltd

3. Software Development Life Cycle
MOHAMMED REHAB
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4. Modern Software Development
• Modern software development is no longer a
simple process
• There is a process that accompanies the
development of every software
• SDLC is a collection of best practices and
methodologies

5. Why understand SDLC?
• Helps to improve the quality of your work
• Helps to improve your productivity
• Without an accepted process and
methodology there are chances to –
– Deliver the project late
– Deliver the project over budget

6. MODELS

7. MODELS
• Waterfall Model
• Incremental Model
• Agile Model
• Spiral Model

8. WATERFALL MODEL
• First process model that was introduced
• Also referred to as linear sequential life cycle
model
• Very simple to understand and use

9. WATERFALL MODEL

10. WATERFALL MODEL
• Each phase must be fully completed before
the next phase begins
• A review takes place at the end of each phase
• Phases do not overlap

11. Advantages of Waterfall model
• Easy to understand and use
• Phases are processed and completed one at a
time
• Works well for smaller projects

12. Disadvantages of Waterfall model
• No working software is produced until late
during the life cycle
• Not a good model for complex projects
• Even a small change in a phase can cause big
problems in the subsequent phases

13. When to use Waterfall model
• When requirements are well known and clear
• When the project to be developed is small

14. INCREMENTAL MODEL

15. INCREMENTAL MODEL
• Whole requirement is divided into various
builds
• Multiple development cycles take place
• Cycles are divided up into more easily
manageable modules

16. INCREMENTAL MODEL
• Each module passes through the design,
implementation and testing phases
• Working version of the software is produced with the
first module

17. INCREMENTAL MODEL
• Each subsequent release of module adds
function to the previous release
• The process continues till the complete system
is achieved

18. Advantages of Incremental model
• Generates working software early during the
software life cycle
• Easier to test and debug
• Customer can respond to each built

19. Disadvantages of Incremental model
• Needs good planning and design
• Needs a clear and complete idea of whole
system before it can be broken down

20. When to use Incremental model
• Requirements of the complete system are
clearly understood
• There is a need to get a product to the market
early

21. AGILE MODEL

22. AGILE MODEL
• It is also a type of incremental model
• Software is developed in rapid cycles
• Small incremental releases with each release
building on previous functionality
• Each release is thoroughly tested to ensure
software quality

23. Advantages of Agile model
• Customer satisfaction by rapid, continuous
delivery of useful software
• Customers, developers and testers constantly
interact with each other
• Working software is delivered frequently
(weeks rather than months)

24. Disadvantages of Agile model
• There is lack of emphasis on necessary
designing and documentation
• It is no place for new programmers, unless
combined with experienced resources

25. When to use Agile model
• Frequency of new increments to the software
is more
• Stakeholders find that they get more freedom
of time and options using this model

26. SPIRAL MODEL
• A model similar to incremental model with
more emphasis on risk analysis
• Has four phases
– Planning
– Risk analysis
– Engineering
– Evaluation
• A software project repeatedly passes through
these phases

27. SPIRAL MODEL

28. SPIRAL MODEL
• Planning phase
– Requirements are gathered
• Risk analysis phase
– A process is undertaken to identify the risks and
alternate solutions
– A prototype is produced at the end of this phase

29. SPIRAL MODEL
• Engineering phase
– Software is produced in this phase
• Evaluation phase
– Allows the customer to evaluate the output of the
project to date before the project continues to the
next spiral

30. Advantages of Spiral model
• High amount of risk analysis and hence,
avoidance of Risk is enhanced
• Additional Functionality can be added at a
later date
• Software is produced early in the software life
cycle

31. Disadvantages of Spiral model
• Risk analysis requires highly specific expertise
• Project’s success is highly dependent on the
risk analysis phase
• Less effective for smaller projects

32. When to use Spiral model
• When costs and risk evaluation is important
• For medium to high-risk projects
• Users are unsure of their needs

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