The document discusses various software process models essential for guiding the software development lifecycle, including the classical waterfall model, iterative waterfall model, evolutionary model, prototyping model, and spiral model. Each model has distinct advantages and disadvantages, influencing their suitability depending on project requirements, flexibility, and user involvement. It highlights the importance of structured frameworks for successful project management and effective communication throughout development.

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Software Process Model’s

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Content
• What is Software Model (Basics)?
• Life Cycle Model
• Classical Waterfall Model
• Iterative Waterfall Model
• Prototyping Model
• Evolutionary Model
• Spiral Model
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What is Software Model?
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Key Points of Software Process Model:-
Software process models are crucial in
the field of software development. They
provide a systematic approach to guide
the software development lifecycle,
ensuring the successful completion of
projects.
Or
Software process models are
frameworks that define the sequence of
activities, tasks, and deliverables
required to develop high-quality
software.
These models act as a roadmap,
providing a step-by-step guide for
software development teams.
• Requirements gathering and
analysis.
• Design and architecture.
• Coding and implementation.
• Testing and quality assurances.
• Deployment and maintenance.

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Life Cycle Model
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1). What is Life cycle Model? Why do we need to use a Life cycle Model in our Project?
o A life cycle model is a way of organizing and
visualizing the various stages that a project or
product goes through from its beginning to its
end.
o It provides a roadmap for the development
process, outlining the steps involved in
planning, designing, building, testing,
deploying, and maintaining the product or
project.
o Different life cycle models offer various
approaches to managing these stages, and
the choice of model depends on the nature of
the project and the goals of the development
team.
A life cycle model is needed because it helps us
plan, organize, and manage the different stages
of a project or product development. It provides a
structured framework to ensure that the work is
carried out in a systematic way, from the initial
idea to the final product.
Here are a few reasons why life cycle models are
essential:
i. Organization
ii. Planning
iii. Communication
iv. Risk management
v. Quality Assurances
vi. Flexibility

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Life Cycle Model
Spiral
Model
Classical
Waterfall
Model
Iterative
Waterfall Model
Prototyping
Model
Evolutionary
Model

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1. Classical Waterfall Model
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What is Classic Waterfall Model Advantages of Classical Waterfall Model
The classic waterfall model is a linear and sequential approach
to software development. It divides the entire process into
distinct phases, and each phase must be completed before
moving on to the next. The phases typically include:
1. Requirements: Gathering and defining what the software
needs to do.
2. Design: Planning how the software will be structured and
function.
3. Implementation: Writing the actual code or creating the
software based on the design.
4. Testing: Verifying that the software works correctly and
meets the specified requirements.
5. Deployment: Introducing the software to users or a
production environment.
6. Maintenance: Addressing issues, making updates, and
ensuring the software continues to meet user needs.
• Clear Structure
• Well Defined Phases
• Documented Process
• Client Involvement
Disadvantages of Classical Waterfall Model
• Inflexibility
• Limited Client Interaction
• Late Detection of issues
• Long Delivery Time
• Lack of Adaptability
• Risk of Project Failure

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1. Classical Waterfall Model
Design
Feasibility Study
Req. Analysis
Coding
Testing
Maintenance
Where do we use Classic Waterfall Model?
The classic waterfall model is best suited for
certain types of projects where the requirements
are well-defined, stable, and unlikely to change
significantly during the development process.
• Well-Understood Projects
• Predictable Environments
• Small to Medium-sized Projects
• Projects with Fixed Budgets and Timelines
We cannot use classical waterfall model when
we have a project that requires e dynamic and
evolving environments.

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2. Iterative Waterfall Model
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What is Iterative Waterfall Model ? Advantages of Iterative Waterfall Model
The Iterative Waterfall Model is a variation of the
classic waterfall model that allows for some flexibility
and revisiting of stages. Instead of progressing
linearly through each phase only once, the project
cycles through the stages in a repetitive manner, with
the opportunity to go back and make adjustments as
needed. Each iteration represents a complete cycle
through all the phases, allowing for feedback,
improvements, and adjustments before moving to the
next iteration. This approach acknowledges that
requirements and understanding can evolve, and it
provides a more adaptable framework compared to
the strict linearity of the classic waterfall model.
• Flexibility
• Feedback Incorporation
• Risk Management
• Progressive Refinement
Disadvantages of Iterative Waterfall Model
• Complexity
• Increased Cost
• Time-Consuming
• Documentation Overhead
• Frequent changes in project – Scope Creep
• Dependency on Initial Requirments
• Potential and Confusion
• Early Detection of
Problem
• Client Involvement
• Parallel Development

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2. Iterative Waterfall Model
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Design
Feasibility Study
Req. Analysis
Coding
Testing
Maintenance
Where do we use Iterative Waterfall Model?
The Iterative Waterfall Model is typically used in
projects where there is a need for some level of
flexibility and adaptation during the development
process, but a more structured and sequential
approach is still desired.
• Complex Projects
• Partial Client Involvement
• Incremental Development
• Parallel Development

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3. Evolutionary Model
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What is Evolutionary Model ? Advantages of Evolutionary Model
• The Evolutionary Model, in the context of software
development, is a type of software development
methodology that is iterative and incremental. It is
based on the idea of evolving the software product
over time through multiple cycles or iterations.
• In simple words, imagine building a software
product like growing a tree. Instead of trying to
create the entire tree at once, you start with a basic
structure (trunk) and then gradually add branches,
leaves, and other elements over time. Each cycle
or iteration improves and enhances the software
based on feedback and changing requirements,
allowing it to evolve and adapt to the needs of
users or the project.
• This model is flexible and can accommodate
changes easily, making it suitable for projects
where requirements may not be well-defined
initially or may change frequently during
• Adaptability
• Feedback Incorporation
• Risk Management
• Early Delivery of Basic
Functionality
Disadvantages of Evolutionary Model
• Complexity
• Dependency on User Invovlvement
• Uncertain Timeline
• Documentation Challenges
• Frequent changes in project – Scope Creep
• Initial Incomplete Product
• Early Detection of
Problem
• Client Involvement
• Parallel
Development

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3. Evolutionary Model
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A A
B
A
B
C
When do we need Evolutionary Model
The evolutionary model is a
software development
methodology that is based on
the idea of incremental
development and delivery of
small, functional parts of a
system. It involves continuous
refinement of the software based
on feedback and evolving
requirements. This model is
particularly suitable for projects
where the requirements are
expected to change frequently
and are not well understood in
the beginning.

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4. Prototyping Model
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What is Prototyping Model ? Advantages of Prototyping Model
The prototyping model in software development is like
creating a rough draft or a sample version of the
software before building the final product. Instead of
trying to define all the details upfront, developers and
users work together to build a basic version
(prototype) of the software. This prototype helps
everyone involved to see how the software might
work and look, gather feedback, and make
improvements before creating the complete, finished
software. It's like a trial version that helps in figuring
out what exactly is needed and how it should work.
• Early Understanding
• User Feedback
• Reduce Risk
• Improved Communication
Disadvantages of Prototyping Model
• Scope Creep
• Time Consuming
• Incomplete Functionality
• Miscommunication
• Overemphasis on Aesthetics
• Clearer
Requirements

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4. Prototyping Model
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Requirements
Gathering
Quick
Analysis
Build
Prototyp
e
Customer
Evaluation of
Prototype
Refine
Requirements
Customer
Satisfication
Design
Implementation
Test
Maintenance

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5. Spiral Model
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What is Spiral Model ? Advantages of Spiral Model
Spiral Model is a flexible and iterative approach to
software development that combines elements of
both waterfall (sequential) and iterative development
models. The process is represented as a spiral, and
each loop of the spiral represents a phase in the
software development life cycle. The key features of
the Spiral Model are risk assessment, regular
feedback from users, and the ability to make
adjustments as the project progresses.
• Flexibility
• Risk Management
• Incremental Development
• Regular Feedback
Disadvantages of Spiral Model
• Complexity
• Resources Intensive
• Time Consuming
• Not Suitable for Small Projects
• Potential for Scope Creep
• Accommodate
Changes

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5. Spiral Model
Determine Objectives Identify & Resolve
Risks
Review and plan for
next phase
Develop Next Level of
Product

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