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COCOMO Cost Drivers

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Each SystemStar 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

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