The Intermediate COCOMO is an extension of the Basic COCOMO model, and is used to estimate the programmer time to develop a software product. This extension considers a set of "cost driver attributes" that can be grouped into four major categories, each with a number of subcategories: Basic COCOMO is a form of the COCOMO model. ...
Product attributes
Required software reliability
Size of application database
Complexity of the product
Hardware attributes
Run-time performance constraints
Memory constraints
Volatility of the virtual machine environment
Required turnabout time
Personnel attributes
Analyst capability
Software engineer capability
Applications experience
Virtual machine experience
Programming language experience
Project attributes
Use of software tools
Application of software engineering methods
Required development schedule
Each of the 15 attributes is rated on a 6-point scale that ranges from "very low" to "extra high" (in importance or value). Based on the rating, an effort multiplier is determined from the table below. The product of all effort multipliers results in an 'effort adjustment factor (EAF). Typical values for EAF range from 0.9 to 1.4.
Cost Drivers
Ratings
Very Low
Low
Nominal
High
Very High
Extra High
Product attributes
Required software reliability
0.75
0.88
1.00
1.15
1.40
Size of application database
0.94
1.00
1.08
1.16
Complexity of the product
0.70
0.85
1.00
1.15
1.30
1.65
Hardware attributes
Run-time performance constraints
1.00
1.11
1.30
1.66
Memory constraints
1.00
1.06
1.21
1.56
Volatility of the virtual machine envionment
0.87
1.00
1.15
1.30
Required turnabout time
0.87
1.00
1.07
1.15
Personnel attributes
Analyst capability
1.46
1.19
1.00
0.86
0.71
Software engineer capability
1.29
1.13
1.00
0.91
0.82
Applications experience
1.42
1.17
1.00
0.86
0.70
Virtual machine experience
1.21
1.10
1.00
0.90
Programming language experience
1.14
1.07
1.00
0.95
Project attributes
Use of software tools
1.24
1.10
1.00
0.91
0.82
Application of software engineering methods
1.24
1.10
1.00
0.91
0.83
Required development schedule
1.23
1.08
1.00
1.04
1.10
The Intermediate Cocomo formula now takes the form...
E=ai(KLOC)(bi).EAF
where E is the effort applied in person-months, KLOC is the estimated number of thousands of delivered lines of code for the project and EAF is the factor calculated above. The coefficient ai and the exponent bi are given in the next table.
Software project
ai
bi
Organic
3.2
1.05
Semi-detached
3.0
1.12
Embedded
2.8
1.20
The Development time D is calculated from E in the same way as with Basic COCOMO.
COCOMO is a model designed by Barry Boehm to give an estimate of the number of man-months it will take to develop a software product.
IntermediateCOCOMO - computes software development effort as function of program size and a set of "cost drivers" that include subjective assessment of product, hardware, personnel and project attributes.
Detailed COCOMO - incorporates all characteristics of the intermediate version with an assessment of the cost driver's impact on each step (analysis, design, etc.) of the software engineering process.
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