Reliability of COSMIC Functional Size Measurement Results: A Multiple Case Study on Industry Cases

Top, Ozden Ozcan
Demirörs, Onur
Ozkan, Baris
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. Problems in the individual learning process and the clarity of the guidelines are distinguished as the two main causes that impact the accuracy of the measurement results.


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, ...
Exploration of an Error Prevention Model for COSMIC Functional Size Measurement Method
Salmanoğlu, Murat; Demirörs, Onur (2012-10-19)
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...
Evaluation of the Effect of Functional Similarities on Development Effort
Top, Ozden Ozcan; Tunalilar, Seckin; Demirörs, Onur (2008-09-05)
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 e...
PL FSM: An Approach and a Tool for the Application of FSM in SPL Environments
Eren, Onder; ÖZKAN, BARIŞ; Demirörs, Onur (2015-08-28)
In order to develop cost-efficient software it is crucial to measure the accurate software size. However; measuring the software size has up to now been almost entirely a manual process and, as such, is both time-consuming and prone to human error which can end up with time and money loss. Automation of this process is a must for the software developing companies to improve the quality of project and budget planning. This paper introduces a mapping between COSMIC concept elements and UML conceptual elements...
E-Cosmic: A Business Process Model Based Functional Size Estimation Approach
Kaya, Mahir; Demirörs, Onur (2011-09-02)
Software size is the key input for cost and effort estimation models. The effort and cost estimations as well as software size is needed at as early a phase of the project as possible. Conventional Early Functional Size Estimation methods enable predicting size at early phases but frequently variation of the results are high due to manual calculations and requirements of high degree of interpretation in situations where there is a lack of structured artifacts. On the other hand, automated Functional Size Me...
Citation Formats
O. O. Top, O. Demirörs, and B. Ozkan, “Reliability of COSMIC Functional Size Measurement Results: A Multiple Case Study on Industry Cases,” 2009, Accessed: 00, 2020. [Online]. Available: