Evaluation of the Effect of Functional Similarities on Development Effort

Top, Ozden Ozcan
Tunalilar, Seckin
Demirörs, Onur
Although functional size is the primary input for effort and cost estimation formulas, the relation between functional size and development effort does not always hold in practice. Calculating the magnitude of functional similarity is perceived as a partial solution to overcome this problem. In this study we applied different approaches to identify the magnitude of functional similarity in five projects. The applicability of these approaches is evaluated by observing the impact of functional similarity on effort and code size of the projects. We also discuss the challenges, difficulties and opportunities faced during the case studies.
34th EUROMICRO Conference on Software Engineering and Advanced Applications


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The reliability of Functional size is crucial for effort and cost estimation in software development projects. However, estimation results may differ because of the errors made in the measurement process. This research proposes an error prevention model for COSMIC Functional Size Measurement method to increase the reliability of the measurements. The model has two main suggestions; first, to use the types of the functional processes during the measurement to prevent errors, and the second, to use a cardinal...
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Top, Ozden Ozcan; Demirörs, Onur; Ozkan, Baris (2009-08-29)
Accuracy of the functional size is critical in software project management, since functional size is the most prevalent input for effort and cost estimation models. Functional size measurement is performed based on standardized manuals; however, the accuracy of FSM results is still based on the knowledge and cautions of the measurers. In this study we performed a multiple case study to identify the reliability of COSMIC and to observe the frequently encountered errors during functional size measurement. Pro...
Making Functional Similarity Count for More Reliable Effort Prediction Models
Top, Ozden Ozcan; Demirörs, Onur; Turetken, Oktay (2009-09-16)
This paper evaluates the impact of functional similarities on the relation between functional size and software development effort. The estimation of the required effort cannot be achieved within reasonable limits at all times. We aimed to address this problem by considering functional similarities. Functional similarity is calculated for COSMIC measurement size results as adjusted functional sizes. The case study includes six cases. We discussed the challenges and the improvement opportunities of the method.
On the Seven Misconceptions about Functional Size Measurement
ÖZKAN, BARIŞ; Demirörs, Onur (2016-10-07)
Among the various approaches to software size measurement, Functional Size Measurement has been widely recognized for its usability in early phases of software development cycles and its independence from implementation language, development method and technology. Starting from its introduction with the original Function Point Analysis method in 1979, functional size has been a favored input to estimation and productivity models. As a result of the search for solutions to emerging measurement needs and the ...
Measureability of functional size in Agile software projects: Multiple case studies with COSMIC FSM
Hacaloglu, Tuna; Demirörs, Onur (2019-01-01)
Functional size measurement (FSM) has been used in software engineering for decades as a main driver for estimation and significant input for other various project management activities throughout the project life span. To apply FSM accurately at the early stages of software development process, especially for estimation purposes, functional user requirements need to be available in detail as required by the adopted FSM method. However, in agile software development, requirement specifications, in general, ...
Citation Formats
O. O. Top, S. Tunalilar, and O. Demirörs, “Evaluation of the Effect of Functional Similarities on Development Effort,” presented at the 34th EUROMICRO Conference on Software Engineering and Advanced Applications, Parma, Italy, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57793.