project estimation toolssaiedian/teaching/sp16/811/papers/stu... · project type calibration uses...
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Project Estimation Tools
Shellie Wedman
March 28, 2011
EECS 811
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Contents
● COCOMO II
- estimation and COCOMO II
- Center for Systems and Software Engineering
● Estimation Tools
- Construx Estimate
- Costar 7.0
● Function Point Analysis Tool
- standard and enterprise edition
● Summary
● Questions 2
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● Confidence level
● Parameters
● Constraints
● Acceptable Product
Estimation Goal
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Cost of Estimation Error
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COCOMO II
● Constructive Cost Model
● Useful for software development processes
● Quantitative framework
● Allows users to reason about tradeoffs
● 17 cost drivers
● 5 scale factors
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Center for Systems and Software Engineering
COCOMO cost and scale drivers
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Center for Systems and Software Engineering
http://csse.usc.edu/csse/
● Constraints
- 500 UFP
- Java
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Contents
● COCOMO II
- estimation and COCOMO II
- Center for Systems and Software Engineering
● Estimation Tools
- Construx Estimate
- Costar 7.0
● Function Point Analysis Tool
- standard and enterprise edition
● Summary
● Questions 8
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Construx Estimate Tool
● Founded in 1996 by Steve McConnell
● Mission: Advancing the art and science of commercial
software engineering.
● Tools – Estimate and Code Surveyor
● Management toolbox – checklists, templates
● White papers, Posters, and Webinars
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Construx Estimate Tool – Free
● License Agreement: Use on a single computer, made
available “as is”, no warranties
● Size of project must be known
● No phase distribution reports
● Calibrate estimates in three ways
- project type based on industry data
- cost factor
- historical data
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Project Type Calibration
● Uses Industry productivity data
● Easiest
● Least accurate
● Project Types Supported
- Business Systems, Control Systems, Internet
Systems, Intranet, Systems, Microcode /
Firmware, Real-time Embedded / Avionics,
Scientific Engineering / Research, Shrink wrapped
Packages Software
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Cost Factor Calibration
● COCOMO II
- product attributes
- project attributes
- personnel attributes
● Product type and sub type
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Historical Data Calibration
● Most accurate
● Less work required
● Data from 3 or more past organizational projects
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Historical Database Wizard
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Estimation Approaches
● SLIM
- projects follow well defined patterns that can be modeled
with a set of exponential equations
- core of estimations
● COCOMO II
● Monte Carlo Simulation
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Kinds of Units
● Function Point
● Lines of Code
● Functions / Subroutines
● Classes / Modules
● Subsystems
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Estimation Window
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Project Type Comparison
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Avionics Project Estimate
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Internet Project Estimate
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Internet Project
cost factor calibration
Before
After
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Internet Project Updated Estimate
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Internet Project comparison Personnel cost factors adjusted
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Internet Project comparison Product cost factors adjusted
Original Cost Factors
● average complexity
● average size database
● errors cause small and
easily recoverable
losses
Adjusted Cost Factors
● extremely complex
● extremely large
database
● errors pose risk to life
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Estimate Report Manager
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Schedule Probabilities Report
Avionics Project Report Internet Project Report
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Costar
● Component Tree
● Very Descriptive
● Cost
- Single license $1900
- Site license $5000
- Corporate License $25,000
● Supported estimation
models
- COCOMO II with
traditional phases
- COCOMO II with
MBASE.RUP phases
- Ada COCOMO
- COCOMO 81
- Custom model
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Costar Estimate Window
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Costar Detailed Report
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Model tab
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Contents
● COCOMO II
- estimation and COCOMO II
- Center for Systems and Software Engineering
● Estimation Tools
- Construx Estimate
- Costar 7.0
● Function Point Analysis Tool
- standard and enterprise edition
● Summary
● Questions 31
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Function Point Modeler ● Eclipse Graphical Modeling framework (GMF)
● Standard version – free
● Enterprise version - $10,500
● International Function Point User group (IFPUG)
CPM 4.2 and 4.x
– development project counts
– enhancement project counts
– application project counts
● Model Driven Architecture (MDA)
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Standard Function Point Modeler
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4
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Transactional Function
● Type EI, EO or EQ
● Complexity
● UFP automatically
calculated
● Enhancement Type
● Process Type
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Data Function
● Type ILF or ELF
● Complexity
● UFP
● Enhancement Type
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Model Driven Architecture (MDA)
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Enterprise Version Features ● Metrics Management Tool plugin
– manages all IT metrics
● software life cycle experience database (SLED)
● COCOMO II plugin
● Report Designer plugin
● Export to MS Project
● Software Development Process
– RUP
– Waterfall
– Custom 37
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Summary ● COCOMO II
– Estimation and COCOMO II
– Center for Systems and Software Engineering
● Estimation Tools
– Construx
– Costar
● Function Point Analysis tool
– Standard edition
– Enterprise edition
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References ● Boehm, B., Valerdi, R., Lane, A., and Brown, A. (2005),
“COCOMO Suite Methodology and Evolution”, Journal of
Defense Software Engineering.
● Center for Software Engineering, COCOMO II
http://sunset.usc.edu/csse/research/COCOMOII/cocomo_main.
html
● Construx Software, http://www.construx.com
● Costar Sofware, http://www.softstarsystems.com
● Fairley, R. (2009), Managing and Leading Software Projects,
John Wiley & Sons, Inc.
● Function Point Modeler Inc.,
http://www.functionpointmodeler.com
● Putnam model, http://en.wikipedia.org/wiki/Putnam_model
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Questions?
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