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Functional size measures and effort estimation in agile development: A replicated study

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publicationAgile Processes, in Software Engineering, and Extreme Programming - 16th International Conference, XP 2015, Proceedings
PublisherSpringer-Verlag Berlin Heidelberg
Number of pages12
ISBN (Print)9783319186115
Publication statusPublished - 2015
Publication typeA4 Article in a conference publication
Event16th International Conference on Agile Software Development, XP 2015 - Helsinki, Finland
Duration: 25 May 201529 May 2015

Publication series

NameLecture Notes in Business Information Processing
ISSN (Print)1865-1348


Conference16th International Conference on Agile Software Development, XP 2015


To help developers during the Scrum planning poker, in our previous work we ran a case study on a Moonlight Scrum process to understand if it is possible to introduce functional size metrics to improve estimation accuracy and to measure the accuracy of expert-based estimation. The results of this original study showed that expert-based estimations are more accurate than those obtained by means of models, calculated with functional size measures. To validate the results and to extend them to plain Scrum processes, we replicated the original study twice, applying an exact replication to two plain Scrum development processes. The results of this replicated study show that the accuracy of the effort estimated by the developers is very accurate and higher than that obtained through functional size measures. In particular, SiFP and IFPUG Function Points, have low predictive power and are thus not help to improve the estimation accuracy in Scrum.