Software Development Methodologies

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SOFTWARE DEVELOPMENT METHODOLOGIES
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INTRODUCTION

• Software development is a complicated process
  comprising many stages.
• Each step need to be followed to complete the
  process successfully.
• Several software development approaches have been
  used since the origin of information technology,
  in two main categories traditional and agile.

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SOFTWARE DEVELOPMENT LIFE CYCLE
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TRADITIONAL SOFTWARE DEVELOPMENT PROCESS
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TRADITIONAL DEVELOPMENT

• Each phase of the development process is properly
  documented and reviewed in this approach.
• This approach works best for the projects in
  large enterprises where the specifications and
  requirements must be clearly defined.
• Waterfall Model, Spiral Model and V-Model are the
  three widely used models under the traditional
  approach.

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WATERFALL MODEL
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WATERFALL MODEL

• First model developed for the software
  development.
• In The Waterfall approach, the whole process
  of software development is divided into separate
  phases.
• The outcome of one phase acts as the input for
  the next phase sequentially.
• It illustrates the software development process
  in a linear sequential flow also referred to as
  Linear-Sequential Life Cycle Model.

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SPIRAL MODEL
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SPIRAL MODEL

• Spiral model is designed with an aim to reduce
  the risks involved in any phase.
• It is often referred to as a risk-driven model.
• This was the first model which explain why the
  iteration matters.
• It introduces the prototyping in a software
  development process in order to reduce the risks.

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V-MODEL
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V-MODEL

• The V-Model process executes in a sequential
  manner.
• It is often referred to as verification and
  validation method.
• V-Model is best suited for the projects that must
  maintain a strict deadline and meet the
  milestones throughout the process.

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AGILE SOFTWARE DEVELOPMENT PROCESS
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AGILE SOFTWARE DEVELOPMENT

• Agile Methodology promotes the continuous
  iteration of building and testing throughout
  the software development.
• Requirements solutions evolve through
  collaboration between self organizing and cross
  functional teams.
• It works on the principle of custom satisfaction
  by rapid delivery of useful software.

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SCRUM MODEL
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SCRUM MODEL

• SCRUM model is one of the agile development
  methods.
• This model relies on a self-organizing,
  cross-functional team. 
• In the SCRUM model, teams are supported by two
  specific roles. The first is a Scrum Master, who
  can be thought of as a coach for the team. The
  second is product owner who represent clients.

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EXTREME PROGRAMMING MODEL
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EXTREME PROGRAMMING MODEL

• It is intended to improve the software quality
  responsiveness to changing customer requirements.
• Introduces a no. of basic principles practices
  on the top of the agile programming framework.
• Improve productivity due to the frequent
  communication between the customer and
  programmers.

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