Agile COCOMO II: A Tool for Software Cost Estimating by Analogy

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Agile COCOMO II A Tool for Software Cost
Estimating by Analogy

• Cyrus Fakharzadeh
• Barry Boehm
• Gunjan Sharman
• SCEA 2002 Presentation

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Outline

• Introduction
• Background
• Motivation
• Implementation
• Applications
• Conclusions

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Outline

• Introduction
• Background
• Motivation
• Implementation
• Applications
• Conclusions

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Introduction

• Common to estimate software cost and schedule by
  analogy to a previous project
• Including projects that use Agile methods
• Certain key cost factors may change for next
  project
• Want a simple method of software cost estimation
• Goal build a simple tool to achieve this
  objective

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Outline

• Introduction
• Background
• Motivation
• Implementation
• Applications
• Conclusions

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Agile Methods

• Typical approaches
• Adaptive Software Development, Crystal methods,
  Extreme Programming, Feature Driven Development,
  and Scrum
• Definition of agile (Merriam-Webster)
• Marked by the ready ability to move with quick
  easy grace
• Agile COCOMO II is marked by the ready ability to
  move quickly in giving estimates with easy grace

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COCOMO II Cost Drivers
Product Required Software Reliability Database Size Product Complexity Developed for Reusability Documentation Match to Life-Cycle Needs
Platform Execution Time Constraint Main Storage Constraint Platform Volatility
Personnel Analyst Capability Programmer Capability Personnel Continuity Application Experience Platform Experience Language and Tool Experience
Project Use of Software Tools Multisite Development Schedule
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COCOMO II Scale Factors

• Precedentedness
• Development Flexibility
• Architecture/Risk Resolution
• Team Cohesion
• Process Maturity

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Outline

• Introduction
• Background
• Motivation
• Implementation
• Applications
• Conclusions

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COCOMO II Model

• Enter
• Size (SLOC source lines of code)
• Cost Drivers
• Scale Factors
• Produces
• Effort (Person-Months)
• Schedule (Months)
• Staff (People)
• Problem Most people dont want to figure out the
  other parameters
• Solution Focus on one or 2 parameters and not
  the others

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(USC) COCOMO II Shortcomings

• Better suited for software cost experts
• Does not easily support cost estimation by
  analogy
• More knowledge is required to use
• Requires specification of many parameters
• Time-consuming to use
• User interface is more complicated
• Platform-dependent

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Outline

• Introduction
• Background
• Motivation
• Implementation
• Applications
• Conclusions

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Requirements

• Browser Compatibility
• Internet Explorer 6.0
• Netscape 6.2
• Supported Platforms
• PC
• Macintosh
• Linux
• UNIX

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Initialization
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Analogy Parameters

• Total Cost in Dollars
• Total Effort in Person-Months
• Productivity in Dollars / (Function Point)
• Productivity in Dollars / (Lines of Code)
• Productivity in (Function Points) / Person-Month
• Productivity in (Lines of Code) / Person-Month

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Define the Cost Driver Adjustments
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Define the Changes to Scale Factors
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Compute Next Projects Cost
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Options

• 1. Change a Difference Cost Driver/Scale Factor
• 2. Change an Additional Cost Driver/Scale Factor
• 3. Go Back to the Initial Estimate
• 4. View Report
• 5. Estimate Another Project

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Report
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Online Help
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Outline

• Introduction
• Background
• Motivation
• Implementation
• Applications
• Conclusions

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Applications

• Example software applications
• Business
• Defense
• Energy
• Environmental
• Space
• Transportation
• Tradeoff analysis
• Compare options with difference scenarios to
  compare the resulting cost

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Outline

• Introduction
• Background
• Motivation
• Implementation
• Applications
• Conclusions

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Conclusions

• Limitations
• No file system capability for this tool
• Report may be printed/saved, but no way to
  load/save values from a session using the tool
• Need to use USC COCOMO II for such features
• Being beta-tested by CSE Affiliates to be
  released later
• Browser-independent
• Platform-independent