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Evaluating the practical use of different measurement scales in requirements prioritisation

Författare

Summary, in English

The importance of prioritising requirements is widely recognised. A number of different techniques for prioritising requirements have been proposed, some based on an ordinal scale, others on a ratio scale. Some measurement scales provide more information than others, i.e. the ratio scale is richer than the ordinal scale. This paper aims to investigate the differences between the scales used in prioritisation. This is important since techniques using a richer scale tend to be more time-consuming and complex to use. Thus, there is a trade-off between simple techniques only providing ranks and complex techniques providing information about the relative distance between requirements priorities. The paper suggests an approach to measure the skewness of the ratio distribution and a way to use the cost-value approach on ordinal scale data. Four different empirical data sets were used to verify the suggested approaches. The skewness measure seems feasible to determine in which cases the ratio scale is valuable. It indicates that some of our subjects tend to use the extreme values of the scale while others are more modest. The cost-value approach based on ordinal scale data also seems feasible. The requirements selection decisions based on ordinal scale data agree substantially with the decisions based on ratio scale data. Copyright 2006 ACM.

Publiceringsår

2006

Språk

Engelska

Sidor

326-335

Publikation/Tidskrift/Serie

Proceedings of the 2006 ACM/IEEE international symposium on International symposium on empirical software engineering

Volym

2006

Dokumenttyp

Konferensbidrag

Förlag

Association for Computing Machinery (ACM)

Ämne

  • Computer Science

Nyckelord

  • Ratio scale data
  • Cost value approaches
  • Measurement scales
  • Ordinal scale data

Conference name

International Symposium on Empirical Software Engineering

Conference date

2006-09-21 - 2006-09-22

Conference place

Rio de Janeiro, Brazil

Status

Published