Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Comparing productivity means to measure design-build pay-off
Riksrevisionen.
2013 (English)In: Transportforum 2013: granskade artiklar / [ed] Blomqvist, Göran, Linköping: Statens väg- och transportforskningsinstitut, 2013, 7-21 p.Conference paper, Published paper (Refereed)
Abstract [en]

The effect of design-build and other procurement decisions and strategies related to owner and contractor working more together has long been a topic of discussion. The cost and quality effects have however often been concluded in qualitative terms based on participants’ general feelings rather than by objective measurements. Most economics and evaluation literature define productivity as output/input. The first purpose in the current study was to develop methods to calculate construction productivity. The second purpose was to use one of them to compare the mean productivity of all design-build (DB) projects with design-bid-build (DBB) projects. When an extensive literature scan for prevailing definitions, methods and values delivered nothing useful, an own method to calculate productivity was developed and used. First overall annual productivity change was calculated, then the mean difference between DB and DBB, controlling for up to 20 variables. Input, the productivity denominator, was an infrastructure project’s total cost until completed. Output, the productivity numerator, was a weighed aggregation of its road length, railway length and a number of other cost-driving variables. A couple of methods to calculate productivity were prestudied by using annual report data, but none delivered a trustful result. We therefore asked for more precise data directly from the agency. Over 80 project managers were engaged to deliver us road and railway lengths, and about 20 other data variables, in their projects. The variable values were multiplied by expert-determined weights and added into a model cost representing the output. This output was divided by the real cost representing the input. Output/input = the project’s productivity. The means of all projects opened each year constituted a time series and the average annual change was calculated. The nominal annual decline turned out to be about -5 %. Corrected for general inflation, it was about -3 % and corrected with the higher road-works-index it was about -1 %.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2013. 7-21 p.
Series
VTI rapport, ISSN 0347-6030 ; 787
Keyword [en]
Cost, Production, Efficiency, Contract, Road construction, Railway track, Construction, Transport infrastructure
Keyword [sv]
Kostnader, Produktion, Effektivitet, Avtal, Vägbyggnad, Järnvägar, Byggande, Transportinfrastruktur
National Category
Economics and Business
Research subject
Road: General works, surveys, comprehensive works, Road: Economics; Railway: General works, surveys, comprehensive works, Railway: Economics
Identifiers
URN: urn:nbn:se:vti:diva-1864OAI: oai:DiVA.org:vti-1864DiVA: diva2:670656
Conference
Transportforum 2013, Linköping , 9-10 januari 2013
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2014-09-19Bibliographically approved

Open Access in DiVA

fulltext(2839 kB)39 downloads
File information
File name FULLTEXT02.pdfFile size 2839 kBChecksum SHA-512
4d7791dfcd432c2b0492ffd3134ae8ed91255e0e0d7a3de2157bf460e6247a6aed15265d71b2d6ffeb4914d393a72ccacb4e5785577e0c5d3a8fffdffd75be6f
Type fulltextMimetype application/pdf

Economics and Business

Search outside of DiVA

GoogleGoogle Scholar
Total: 43 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 40 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf