UsingSysMLtoEstimateSoSEngineeringandDevelopment.pptVIP

* * * * * * * * * * * * * Using SysML to Estimate SoS Engineering and Development Effort Jo Ann Lane (jolane@) Tim Bohn (tbohn@) COCOMO Forum 2009 Overview System of Systems (SoS) cost estimation overview Systems Modeling Language (SysML) characterizations of SoS Generating SoS cost model inputs from SysML views Summary, conclusions, and future work * Systems Engineering for Systems of Systems * SoS: A set or arrangement of systems that results when independent and useful systems are integrated into a larger system that delivers unique capabilities Focus is on net-centric SoS… SoSE Cost Model: Extension of COSYSMO Engineering Cost Model * Size Drivers Cost Factors Estimated Engineering Effort Calibration Number of System Requirements Number of System Interfaces Number of Algorithms Number of Operational Scenarios People characteristics Process characteristics Product characteristics COSYSMO SoSE cost model uses COSYSMO size drivers and cost factors SoSE Capability Effort Calculation* Total Effort = SoSE effort + ∑ “affected CS”i effort Specific constituent systems (CSs) depend upon alternative selected CSi effort depends upon types of changes required for CSi New interface(s)/interface change(s) Internal algorithm change(s)/data conversions Size driver options Number of requirements ? Number of algorithms Number of interfaces ? Number of operational scenarios Each size driver characterized with respect to complexity All size drivers converted to equivalent # of nominal reqs * * See “backup charts” for details of lower-level SoSE calculations… SoSE Estimation Steps for New Capability Understand/review current CS capabilities Identify new capability alternatives For each alternative, identify CSs that contribute to each alternative For each contributing CS, changes needed to support alternative New interfaces/interface change(s) Data element/algorithm change(s) Capability size count(s) and associated complexity of each Conduct alternative tradeoffs a