Waterfall, Spiral, and Prototyping Methodologies

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Waterfall, Spiral, and Prototyping Methodologies
April 2, 2003

• Shiloh L Alvey
• Mariko Joy McCanless
• Lance Tarvin
• Guo Bin Yang

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Table of contents

• Methodology Defined
• Software Engineering Methodology
• Types of System Development Methodology
• Waterfall
• Spiral
• Prototyping
• The Advantages and Disadvantages of Development
  Methodologies

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Methodology

• Definition
• Methodology - The branch of logic that deals
  with the general principles of the formation of
  knowledge (Websters Dictionary).
• Software Engineering Methodology
• Process for the organized production of software
• Uses a collection of predefined techniques and
  notational conventions
• Usually presented as a series of steps, with
  techniques and notation associated with each step
  (Rumbaugh et al, 1991)
• A structured means of achieving a goal.

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Waterfall Model
www.ecs.soton.ac.uk/nmg/hci/ design/hci-dp-waterf
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Advantages Disadvantages

• Waterfall
• Fits with well understood but complex and large
  projects.
• Cost may be high
• High degree of quality
• Difficult to edit

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Spiral Model
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Advantages Disadvantages

• Spiral
• Slightly improved Waterfall Methodology
• Use to test new technologies and applications
• Performs risk analysis at every stage
• Allows feedback between teams

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Prototype Model
Planning
System Prototype
Implementation
New System
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Advantages Disadvantages

• Prototyping
• Use to test new technologies and applications
• Best for high-risk specifications
• Difficult to control
• Requires frequent editing

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Waterfall, Spiral, and Prototyping Methodologies

• System Development Methodology ensures that
  projects are designed with fixed timescales, and
  procedures.
• Waterfall, Spiral, and Prototyping methodologies
  allow a development team to focus on the pieces
  of functionality at a given time to ensure the
  greatest possible outcome.
• Shiloh, Guo, Mariko, and Lance
• April 2, 2003