Automated Software Cost Estimation.ppt
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1、Automated Software Cost Estimation,By James Roberts EEL 6883 Spring 2007,Background,Over 53% of software projects overrun by more than 50% in both budget and schedule Software overrun in budget is a failure Software overrun in schedule is a failure Goal of software engineering is to deliver software
2、 on time and within budget,Possible Solution,Automated Software Cost Estimation Look at history Generalize data Create equations Parametric,Input Measurements,SLOC Source Lines of Code DSI Delivered Source Instructions Function Points,Cost Estimation Models,COCOMO 81 COCOMO II REVIC SLIM Others,COCO
3、MO,Developed by Barry Boehm in 81 Based on historical database DSI is the input Three versions Basic Model Intermediate Model Detailed Model,COCOMO II,Updated the COCOMO 81 model Allows for Spiral development Rapid prototyping COTS integration OO Design Uses SLOC,REVIC,Revised Intermediate COCOMO De
4、veloped by Ray Kile Updated to use Air Force project data Adds a mode for Ada development Inputs are the same as COCOMO 81,SLIM,Software Life-Cycle Model Developed by Larry Putnam Uses a Rayleigh distribution Project personnel vs. Time Intended for large projects Fewer parameters,QSMs SLIM Tool,Base
5、d on the SLIM model Windows based Easy to use Several different wizards for quickly generating an estimate Five steps to create an estimate,Softstars CoStar,Based on the COCOMO model Windows based Easy to use Many different COCOMO variations Create Estimate Wizard Many parameters required Highly con
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