Software Cost Estimation using COCOMO Intermediate Model
Explore the COCOMO Intermediate Model for software cost estimation, which utilizes a set of 15 cost driver attributes to compute the cost of software projects. The model considers factors such as personnel attributes, product attributes, and project attributes to calculate effort, duration, and person estimates. Learn how to apply the model with examples and understand the formula for effort calculation.
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Presentation Transcript
Cocomo model Intermediate Model
Intermediate Model Uses set of 15 Cost Driver Attributes To compute the cost of software On the scale of 1 to 6, Ranging from Very low (1) Low (2) Nominal (3) High (4) Very high (5) Extra high (6)
Ratings Cost driver attributes Very low low nominal high Very high Extra high Product Attributes Required Software Reliability 0.75 0.88 1 1.40 1.15 Size Of Application Database 0.94 1 1.08 1.16 Complexity Of Software 0.70 0.85 1 1.15 1.30 1.65 Hardware Attributes Run-time Performance Constraints 1 1.11 1.30 1.56 Memory Constraints 1 1.06 1.21 1.56 Volatility Of Virtual Machine 0.87 1 1.15 1.3 Computer Turnabout Time 0.87 1 1.07 1.15
Ratings Cost driver attributes Very low low nominal high Very high Extra high Personnel Attributes Analyst capability 1.46 1.19 1 0.86 0.71 Software engineer s capability 1.42 1.17 1 0.86 0.70 Application s experience 1.29 1.13 1 0.91 0.82 Virtual machine s experience 1.21 1.10 1 0.90 Programming language experience 1.14 1.07 1 0.95 Project Attributes Use of software tools 1.24 1.10 1 0.91 0.82 Application of Software Engineering Methods 1.24 1.10 1 0.91 0.83 Required development schedule 1.23 1.08 1 1.04 1.10
Formula for effort calculation E = Ai * (KLOC) ^ Bi * EAF (person-months) Values for Ai and Bi for various class of software projects are Software project Ai Bi Organic Semi-detached 3.2 3 1.05 1.12 embedded 2.8 1.20
Duration and person estimate, Is same as In basic COCOMO model 2. Duration Estimation D= Cb (E) ^ Db 3. Persons Estimation P= E/D
Example 1 Given data LOC 30000, Embedded software, High reliability E = Ai * (KLOC)^ Bi * EAF For high reliability, Effort Adjustment Factor (EAF) is = 1.15 For embedded project Ai = 2.8 & Bi = 1.20 E = 2.8 *(30)^1.2 * 1.15 = 191 person-months D = Cb * E ^ Db = 2.5 * 191 ^ 0.32 = 13 months P = E / D = 191 /13 = 15 persons approximately
Example 2 For the project of 1,00,000 LOC, Embedded systems, Compose the efforts. if, 1. Highly capable programmer, with very little experience in programming language (EAF 0.86, 1.14) 2. Programmer with low quality, but a lot of experience with programming language (EAF 1.17, 0.95)
For embedded system, Ai = 2.8, Bi = 1.20 KLOC = 100 Formula for effort calculation is E = Ai * (KLOC) ^ Bi * EAF = 2.8 * (100)1.20 * (0.86 * 1.14) = 689 Person months
Duration D = Cb * (E) ^ Db months = 2.5 * (689) ^ 0.32 = 20 months Number of persons P = E / D = 689 / 20 = 34 Persons.
Co-efficients of Ab, Bb,Cb,Db for three models are Software projects Organic Semi- detached embedded Ab Bb Cb Db 2.4 3.0 1.05 1.12 2.5 2.5 0.38 0.35 3.6 1.20 2.5 0.32
