Detailed COCOMO Model Uses, same equations for

karlyn-bohler

Published 2026-08-27 · 10 slides · 0 views

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Detailed COCOMO Model Uses, same equations for estimation, as the intermediate model But detailed model can estimate the effort (E), duration persons (P) Of each of development phases, subsystems, modules Four phases used in detailed

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Detailed COCOMO Model

Uses, same equations for estimation, as the intermediate model

But detailed model can estimate – the effort (E), duration & persons (P)

Of each of development phases, subsystems, modules

Four phases used in – detailed cocomo model are –

Requirement Planning & Product Design (RPD)
Detailed Design (DD)
Code & Unit Test
Integrate & Test

The effort multipliers for detailed COCOMO are Using these detailed cost drivers,

an estimate is determined for each phase of the lifecycle

Example 1 Consider a project to develop a full screen editor.
The major components identified are 
Screen edit
Command language interpreter
File input and output
Cursor movement
Screen movement

The sizes estimated are 
4K, 2K, 1K, 2K and 3K delivered source lines of code.

Use COCOMO model, to determine 
Overall cost and schedule estimates, assume effort adjustment factor (EAF) being 1.21

Solution 
Size in KLOC can be –
Screen edit = 4 KLOC
Command language interpreter = 2 KLOC
Final input & output = 1 KLOC
Cursor movement = 2 KLOC
Screen movement = 3 KLOC
-------------------------------------------------
Total = 12 KLOC

The formula for effort calculation is 

E = Ai * (KLOC) ^ Bi * EAF person – months

For organic project 
Ai = 3.2 and Bi = 1.o5
EAF is given as  1.21

E = 3.2 * (12) ^ 1.05 * 1.21
= 43.48 * 1.21
= 52.61 person - months

Duration for completion of project can be calculated using following formula 

D = Cb * (E) ^ Db months
Cb = 2.5 and Db = 0.38

D = 2.5 * (52.61) ^ 0.38
= 11.27 months

Effort and schedule estimation for different phases 
System design = 0.16 * 25.61 = 8.41 PM
Detail design = 0.26 * 52.61 = 13.67 PM
Module code and test = 0.42 * 52.61 = 22.09 PM
Integration and test = 0.16 * 52.61 = 8.41 PM

Schedule estimation –
System design = 0.19 * 11.27 = 2.14 months
Detail design = 0.24 * 11.27 = 2.70
Module code and test = 0.39 * 11.27 = 4.395
Integration and test = 0.18 * 11.27 = 2.02

Detailed COCOMO Model Uses, same equations for

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