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Each Costar model implements a different set of COCOMO Cost Drivers.  This table shows which Cost Drivers are in which models.

 

Cost Driver

COCOMO_II Post Architecture

COCOMO_II Early Design

REVIC

COCOMO_87, 

ADA 87,

 APM 88

COCOMO_81,

COCOMO_85

 Personnel Factors       
ACAPAnalyst Capability

Yes

  YesYes Yes
APEX AEXPApplications ExperienceYes   Yes YesYes
PCAPProgrammer CapabilityYes  YesYesYes
LEXPProgramming Language Experience  Yes YesYes
VEXP Virtual Machine Experience   Yes YesYes
PERS Personnel Capability  Yes   
PREXPersonnel Experience Yes    
PCONPersonnel ContinuityYes     
PLEX PEXPPlatform ExperienceYes      
LTEXLanguage and Tool ExperienceYes    
 Product Factors      
RELY Required Software ReliabilityYes Yes YesYes
DATA Database SizeYes  YesYesYes
CPLXSoftware Product ComplexityYes YesYesYes
RUSERequired ReusabilityYesYesYesYes 
DOCUDocumentation Match to Life-Cycle NeedsYes    
RCPXProduct Reliability and Complexity Yes   
 Platform Factors     
TIME Execution Time ConstraintYes YesYesYes
STOR Main Storage ConstraintYes YesYesYes
TURN Computer Turnaround Time  YesYesYes
VIRT Virtual Machine Volatility  Yes Yes
VMVH Virtual Machine Volatility: Host   Yes 
VMVT Virtual Machine Volatility: Target   Yes 
PVOLPlatform VolatilityYes    
PDIFPlatform Difficulty Yes   
PLATPlatform  Yes  
 Project Factors     
TOOL Use of Software ToolsYes YesYesYes
MODP Modern Programming Practices  YesYesYes
SCED Required Development ScheduleYesYesYesYesYes
SECUClassified Security Application  YesYes 
SITEMultisite DevelopmentYes    
FCILFacilities Yes   
RVOLRequirements Volatility  Yes  

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Revised: April 18, 2005