The document discusses several software development life cycle (SDLC) models: Waterfall, V-shaped, structured evolutionary prototyping, rapid application development (RAD), incremental, and spiral. For each model, it describes the key steps, strengths, weaknesses, and scenarios where the model is best applied. The Waterfall model involves sequential phases from requirements to maintenance, while the V-shaped model adds verification and validation phases. Structured evolutionary prototyping uses iterative prototyping for requirements gathering. RAD emphasizes rapid delivery through time-boxing and productivity tools. Incremental development prioritizes requirements delivery in groups. The spiral model incorporates risk analysis, prototyping, and iterative cycles.
These PPT presentation help to understand waterfall model in SDLC. The Waterfall model is the earliest SDLC approach that was used for software development. There are five steps in the waterfall model.
These PPT presentation help to understand waterfall model in SDLC. The Waterfall model is the earliest SDLC approach that was used for software development. There are five steps in the waterfall model.
Software life cycle model: The descriptive and diagrammatic representation of the software life cycle
It represent all the activities performed on software product from the inception to retirement
It also depicts the order in which these activities are to be undertaken
More than one activity can be carried out in a single phase
The primary advantage of adhering to a life cycle model is that it encourages development of software in a systematic and disciplined manner
When a program is developed by a single programmer ,he has the freedom to decide the exact steps through which he will develop the program
Iterative Linear Sequential Model
Software life cycle model: The descriptive and diagrammatic representation of the software life cycle
It represent all the activities performed on software product from the inception to retirement
It also depicts the order in which these activities are to be undertaken
More than one activity can be carried out in a single phase
The primary advantage of adhering to a life cycle model is that it encourages development of software in a systematic and disciplined manner
When a program is developed by a single programmer ,he has the freedom to decide the exact steps through which he will develop the program
Iterative Linear Sequential Model
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Sdlc models
1. “Software Development Life
Cycle(SDLC)”
Submitted by:-
Aditi Kothari
Institute Of Management StudiesInstitute Of Management Studies
Marketing Management
Year 2014-2016
Guided by:-
Prof. Deepak Srivastava
2. 1) SDLC MODEL
2) WATERFALL MODEL
4) V-SHAPED SDLC MODEL
5) STRUCTURED EVOLUTIONARY PROTOTYPING MODEL
6) RAD
7) INCREAMENTAL SDLC MODEL
8) SPIRAL SDLC MODEL
4. SDLC MODEL
A framework that describes the activities performed at each
stage of a software development project.
5. WATERFALL MODEL
Requirements – defines needed
information, function, behavior,
performance and interfaces.
Design – data structures, software
architecture, interface representations,
algorithmic details.
Implementation – source code, database,
user documentation, testing.
Test - test the project on completion
whether it is able to perform certain task
properly.
Installation – install the application on
the required system.
Maintenance – maintain the application
in future.
6. WATERFALL STRENGTHS
• Easy to understand, easy to use
• Provides structure to inexperienced staff
• Milestones are well understood
• Sets requirements stability
• Good for management control (plan, staff, track)
• Works well when quality is more important than
cost or schedule
7. WATERFALL DEFICIENCIES
• All requirements must be known upfront
• Deliverables created for each phase are considered
frozen – inhibits flexibility
• Can give a false impression of progress
• Does not reflect problem-solving nature of software
development – iterations of phases
• Integration is one big bang at the end
• Little opportunity for customer to preview the system
(until it may be too late)
8. WHEN TO USE THE WATERFALL
MODEL
• Requirements are very well known
• Product definition is stable
• Technology is understood
• New version of an existing product
• Porting an existing product to a new
platform.
9. V-SHAPED SDLC MODEL
• A variant of the Waterfall
that emphasizes the
verification and
validation of the
product.
• Testing of the product is
planned in parallel with
a corresponding phase
of development
10. Project and Requirements
Planning – allocate resources
Product Requirements and
Specification Analysis –
complete specification of the
software system
Architecture or High-Level Design
– defines how software functions
fulfill the design
Detailed Design – develop
algorithms for each architectural
component
Production, operation and
maintenance – provide for
enhancement and corrections
System and acceptance testing –
check the entire software system
in its environment
Integration and Testing – check
that modules interconnect
correctly
Unit testing – check that each
module acts as expected
Coding – transform algorithms into
software
V-SHAPED STEPS
11. V-SHAPED STRENGTHS
• Emphasize planning for verification and
validation of the product in early stages of
product development
• Each deliverable must be testable
• Project management can track progress by
milestones
• Easy to use
12. V-SHAPED WEAKNESSES
• Does not easily handle concurrent events
• Does not handle iterations or phases
• Does not easily handle dynamic changes in
requirements
• Does not contain risk analysis activities
13. WHEN TO USE THE V-SHAPED MODEL
• Excellent choice for systems requiring high reliability
– hospital patient control applications
• All requirements are known up-front
• When it can be modified to handle changing
requirements beyond analysis phase
• Solution and technology are known
14. STRUCTURED EVOLUTIONARY
PROTOTYPING MODEL
• Developers build a prototype during the requirements
phase
• Prototype is evaluated by end users
• Users give corrective feedback
• Developers further refine the prototype
• When the user is satisfied, the prototype code is
brought up to the standards needed for a final
product.
15. STRUCTURED EVOLUTIONARY
PROTOTYPING STEPS
• A preliminary project plan is developed
• An partial high-level paper model is created
• The model is source for a partial requirements
specification
• A prototype is built with basic and critical attributes
• The designer builds
the database
user interface
algorithmic functions
• The designer demonstrates the prototype, the user
evaluates for problems and suggests improvements.
• This loop continues until the user is satisfied
16. STRUCTURED EVOLUTIONARY
PROTOTYPING STRENGTHS
• Customers can “see” the system requirements as they
are being gathered
• Developers learn from customers
• A more accurate end product
• Unexpected requirements accommodated
• Allows for flexible design and development
• Steady, visible signs of progress produced
• Interaction with the prototype stimulates awareness of
additional needed functionality
17. STRUCTURED EVOLUTIONARY
PROTOTYPING WEAKNESSES
• Tendency to abandon structured program development
for “code-and-fix” development
• Bad reputation for “quick-and-dirty” methods
• Overall maintainability may be overlooked
• The customer may want the prototype delivered.
• Process may continue forever (scope creep)
18. WHEN TO USE
STRUCTURED EVOLUTIONARY
PROTOTYPING
• Requirements are unstable or have to be clarified
• As the requirements clarification stage of a waterfall
model
• Develop user interfaces
• Short-lived demonstrations
• New, original development
• With the analysis and design portions of object-
oriented development.
19. RAPID APPLICATION MODEL (RAD)
• Requirements planning phase (a workshop
utilizing structured discussion of business
problems)
• User description phase – automated tools capture
information from users
• Construction phase – productivity tools, such as
code generators, screen generators, etc. inside a
time-box. (“Do until done”)
• Cutover phase -- installation of the system, user
acceptance testing and user training
20. RAD STRENGTHS
• Reduced cycle time and improved
productivity with fewer people means lower
costs
• Time-box approach mitigates cost and
schedule risk
• Customer involved throughout the complete
cycle minimizes risk of not achieving
customer satisfaction and business needs
• Focus moves from documentation to code
(WYSIWYG).
• Uses modeling concepts to capture
information about business, data, and
processes.
21. RAD WEAKNESSES
• Accelerated development process must give
quick responses to the user
• Risk of never achieving closure
• Hard to use with legacy systems
• Requires a system that can be modularized
• Developers and customers must be
committed to rapid-fire activities in an
abbreviated time frame.
22. WHEN TO USE RAD
• Reasonably well-known requirements
• User involved throughout the life cycle
• Project can be time-boxed
• Functionality delivered in increments
• High performance not required
• Low technical risks
• System can be modularized
23. INCREMENTAL SDLC MODEL
Construct a partial
implementation of a total
system
Then slowly add increased
functionality
The incremental model
prioritizes requirements of
the system and then
implements them in groups.
Each subsequent release of
the system adds function to
the previous release, until all
designed functionality has
been implemented.
24. INCREMENTAL MODEL STRENGTHS
• Develop high-risk or major functions first
• Each release delivers an operational product
• Customer can respond to each build
• Uses “divide and conquer” breakdown of tasks
• Lowers initial delivery cost
• Initial product delivery is faster
• Customers get important functionality early
• Risk of changing requirements is reduced
25. INCREMENTAL MODEL WEAKNESSES
• Requires good planning and design
• Requires early definition of a complete and
fully functional system to allow for the
definition of increments
• Well-defined module interfaces are required
(some will be developed long before others)
• Total cost of the complete system is not
lower
26. WHEN TO USE THE INCREMENTAL MODEL
• Risk, funding, schedule, program complexity, or
need for early realization of benefits.
• Most of the requirements are known up-front but
are expected to evolve over time
• A need to get basic functionality to the market
early
• On projects which have lengthy development
schedules
• On a project with new technology
27. SPIRAL SDLC MODEL
• Adds risk analysis,
and 4gl RAD
prototyping to the
waterfall model
• Each cycle
involves the same
sequence of steps
as the waterfall
process model
28. SPIRAL MODEL STRENGTHS
• Provides early indication of insurmountable
risks, without much cost
• Users see the system early because of rapid
prototyping tools
• Critical high-risk functions are developed
first
• The design does not have to be perfect
• Users can be closely tied to all lifecycle
steps
• Early and frequent feedback from users
• Cumulative costs assessed frequently
29. SPIRAL MODEL WEAKNESSES
• Time spent for evaluating risks too large for small or low-
risk projects
• Time spent planning, resetting objectives, doing risk
analysis and prototyping may be excessive
• The model is complex
• Risk assessment expertise is required
• Spiral may continue indefinitely
• Developers must be reassigned during non-development
phase activities
• May be hard to define objective, verifiable milestones that
indicate readiness to proceed through the next iteration
30. WHEN TO USE SPIRAL MODEL
• When creation of a prototype is appropriate
• When costs and risk evaluation is important
• For medium to high-risk projects
• Long-term project commitment unwise
because of potential changes to economic
priorities
• Users are unsure of their needs
• Requirements are complex
• New product line
• Significant changes are expected (research
and exploration)