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Simplifying effort estimation based on Use Case Points

Mirosław Ochodek, Jerzy Nawrocki, and Kamil Kwarciak (2011)

Information and Software Technology, 53(3):200-213.

Context: The Use Case Points (UCP) method can be used to estimate software development
effort based on a use-case model and two sets of adjustment factors relating to the environmental and
technical complexity of a project. The question arises whether all of these components are important
from the effort estimation point of view.

Objective: This paper investigates the construction of UCP in order to find possible ways of simplifying it.

Method: The cross-validation procedure was used to compare the accuracy of the different variants of
UCP (with and without the investigated simplifications). The analysis was based on data derived from a
set of 14 projects for which effort ranged from 277 to 3593 man-hours. In addition, the factor analysis
was performed to investigate the possibility of reducing the number of adjustment factors.

Results: The two variants of UCP - with and without unadjusted actor weights (UAW) provided similar
prediction accuracy. In addition, a minor influence of the adjustment factors on the accuracy of UCP
was observed. The results of the factor analysis indicated that the number of adjustment factors could
be reduced from 21 to 6 (2 environmental factors and 4 technical complexity factors). Another
observation was made that the variants of UCP calculated based on steps were slightly more accurate
than the variants calculated based on transactions. Finally, a recently proposed use-case-based size
metric TTPoints provided better accuracy than any of the investigated variants of UCP.

Conclusion: The observation in this study was that the UCP method could be simplified by rejecting
UAW; calculating UCP based on steps instead of transactions; or just counting the total number of steps
in use cases. Moreover, two recently proposed use-case-based size metrics Transactions and TTPoints
could be used as an alternative to UCP to estimate effort at the early stages of software development.

effort estimation, use case points, ttpoints, use-case transaction

Projekt realizowany w ramach programu Ventures Fundacji na rzecz Nauki Polskiej współfinansowanego ze środków Unii Europejskiej – Europejskiego Funduszu Rozwoju Regionalnego


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