Detailed COCOMO Model
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 –
1.
Requirement Planning & Product Design
(RPD)
2.
Detailed Design (DD)
3.
Code & Unit Test
4.
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
1.
Screen edit
2.
Command language interpreter
3.
File input and output
4.
Cursor movement
5.
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 –
1.
Screen edit = 4 KLOC
2.
Command language interpreter = 2 KLOC
3.
Final input & output = 1 KLOC
4.
Cursor movement = 2 KLOC
5.
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
1.
System design = 0.16 * 25.61 = 8.41 PM
2.
Detail design = 0.26 * 52.61 = 13.67 PM
3.
Module code and test = 0.42 * 52.61 = 22.09 PM
4.
Integration and test = 0.16 * 52.61 = 8.41 PM
Schedule estimation –
1.
System design = 0.19 * 11.27 = 2.14 months
2.
Detail design = 0.24 * 11.27 = 2.70
3.
Module code and test = 0.39 * 11.27 = 4.395
4.
Integration and test = 0.18 * 11.27 = 2.02
COCOMO (Constructive Cost Model) is a detailed software cost estimation model that helps project managers assess resources, schedule, and budget. It provides a systematic approach to forecasting the effort and time required for a software project. The model takes into account various factors such as project size, complexity, and team experience to provide accurate estimates. Understanding and implementing the COCOMO model can improve project planning and increase the likelihood of successful project completion.
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Presentation Transcript
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 1. Requirement Planning & Product Design (RPD) 2. Detailed Design (DD) 3. Code & Unit Test 4. Integrate & Test
The effort multipliers for detailed COCOMO are Using these detailed cost drivers, an estimate is determined for each phase of the lifecycle Phases Very Low Low Nominal High Very High RPD 1.8 0.85 1 0.75 0.55 DD 1.35 0.85 1 0.9 0.75 CUT 1.35 0.85 1 0.9 0.75 IT 1.5 1.2 1 0.85 0.7
Example 1 1. 2. 3. 4. 5. 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
System design Detail design Module code and test Integration and test Effort 0.16 0.26 0.42 0.16 Time 0.19 0.24 0.39 0.18
Solution Size in KLOC can be 1. Screen edit = 4 KLOC 2. Command language interpreter = 2 KLOC 3. Final input & output = 1 KLOC 4. Cursor movement = 2 KLOC 5. 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 1. System design = 0.16 * 25.61 = 8.41 PM 2. Detail design = 0.26 * 52.61 = 13.67 PM 3. Module code and test = 0.42 * 52.61 = 22.09 PM 4. Integration and test = 0.16 * 52.61 = 8.41 PM Schedule estimation 1. System design = 0.19 * 11.27 = 2.14 months 2. Detail design = 0.24 * 11.27 = 2.70 3. Module code and test = 0.39 * 11.27 = 4.395 4. Integration and test = 0.18 * 11.27 = 2.02
