Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. The impact of design properties on development cost in objectoriented systems
 IEEE Computer Society: 7th International Software Metrics Symposium 2001. Proceedings : 4  6 April 2001, London Los Alamitos, Calif.: IEEE Computer Society, 2001 ISBN: 0769510434 ISBN: 0769510442 S.260271 : Ill., Lit. 
 International Software Metrics Symposium <7, 2001, London> 

 Englisch 
 Konferenzbeitrag 
 Fraunhofer IESE () 
 cost estimation; objectoriented measurement; empirical validation 
Abstract
In the context of software cost estimation, system size is widely taken as a main driver of system development effort. But other structural design properties, such as coupling, cohesion, complexity have been suggested as additional cost factors. In this paper, using effort data from an objectoriented development project, we empirically investigate the relationship between class size and the development effort for a class, and what additional impact structural properties such as class coupling have on effort.
We use Poisson regression and regression trees to build cost prediction models from size and design measures, and use these models to predict system development effort. We also investigate a recently suggested technique to combine regression trees with regression analysis, which aims at building more accurate models.
Results indicate that fairly accurate predictions of class effort can be made based on simple measures of the class interface size alone (mean MREs below 30 %). Effort predictions at the system level are even more accurate as, using Bootstrapping, the estimated 95 % confidence interval for MREs is 3 %  23 %. But more sophisticated coupling and cohesion measures do not help to improve these predictions to a degree that would be practically significant. However, the use of hybrid models, combining Poisson regression and CART regression trees clearly improves the accuracy of the models, as compared to using Poisson regression alone.