L. Hommen and M. Rolfstam, Public Procurement and Innovation: Towards a Taxonomy, Journal of Public Procurement, vol.9, issue.1, pp.17-56, 2009.

. Ssb, Offentlig sektor kjøpte datautstyr og programvare for 6,6 milliarder i Available from: http://www.ssb, 2006.

G. Iyer, S. Ravindran, and P. M. Reckers, Procurement of IT Consulting Services and Firm-Specific Characteristics, Journal of the Association of Information Systems, vol.7, issue.4, pp.207-239, 2006.

I. Keiichiro and M. Hajime, How Local Governments Should Procure Information Systems? (Abstract in English), Proceedings of the 19th Annual Conference on JSAI, 2005.

T. Saarinen and A. P. Vepsäläinen, Procurement Strategies for Information Systems, Journal of Management Information Systems, vol.9, issue.1, pp.187-208, 1994.
DOI : 10.1287/mnsc.38.3.307

P. Hallikainen and H. Kivijärvi, Determining Information Systems Procurement Strategies -AHP Approach, The Fifth International Symposium on The Analytic Hierarchy Process, 1999.

G. S. Dawson, R. T. Watson, and M. Boudreau, Information Asymmetry in Information Systems Consulting: Toward a Theory of Relationship Constraints, Journal of Management Information Systems, vol.14, issue.2, pp.143-178, 2011.
DOI : 10.1002/mde.4090140203

. Riksrevisjonen, Riksrevisjonens oppfølging av forvaltningsrevisjoner behandlet av Stortinget, 2008.

A. Davila, M. Gupta, and R. J. Palmer, Moving Procurement Systems to the Internet: The Adoption and Use of E-Procurement Technology Models, SSRN Electronic Journal, vol.21, issue.1, pp.11-23, 2003.
DOI : 10.2139/ssrn.323923

R. Hsiao and T. S. Teo, Delivering on the Promise of E-Procurement, pp.343-360, 2005.

H. Z. Henriksen and V. Mahnke, E-Procurement Adoption in the Danish Public Sector: The Influence of Economic and Political Rationality, Scandinavian Journal of Information Systems, vol.17, issue.2, pp.85-106, 2005.

Y. Wind and R. J. Thomas, Conceptual and Methodological Issues in Organisational Buying Behaviour, European Journal of Marketing, vol.20, issue.5/6, pp.239-263, 2001.
DOI : 10.2307/3150562

R. E. Spekman and L. W. Stern, Environmental Uncertainty and Buying Group Structure: An Empirical Investigation, Journal of Marketing, vol.43, issue.2, pp.43-55, 1979.
DOI : 10.2307/1250741

G. A. Boyne, Public and Private Management: What's the Difference?, Journal of Management Studies, vol.39, issue.1, pp.97-122, 2002.
DOI : 10.1111/1467-6486.00284

G. S. Pan, Information systems project abandonment: a stakeholder analysis, International Journal of Information Management, vol.25, issue.2, pp.173-184, 2005.
DOI : 10.1016/j.ijinfomgt.2004.12.003

B. Doshi, The new OGC guidance: The future roadmap for government IT procurement, Computer Law & Security Review, vol.21, issue.4, pp.344-348, 2005.
DOI : 10.1016/j.clsr.2005.06.006

C. E. Moe, A. K. Risvand, and M. K. Sein, Limits of Public Procurement: Information Systems Acquisition, Electronic Government -5th International Conference, pp.281-292, 2006.
DOI : 10.1007/11823100_25

K. V. Thai, Advancing Public Procurement: Practices, Innovation and Knowledge Sharing, 2006.
DOI : 10.1007/978-3-319-13434-5_1

W. C. Lawther and L. L. Martin, Innovative practices in public procurement partnerships: The case of the United States, Journal of Purchasing and Supply Management, vol.11, issue.5-6, pp.5-6, 2005.
DOI : 10.1016/j.pursup.2005.12.003

K. Loader, Is local authority procurement ???lean???? An exploration to determine if ???lean??? can provide a useful explanation of practice, Journal of Purchasing and Supply Management, vol.16, issue.1, pp.41-50, 2010.
DOI : 10.1016/j.pursup.2009.10.001

B. E. Tyssedal, Life cycle cost based procurement decisions. A case study of Norwegian Defence Procurement pojects, International Journal of Porject Management, vol.26, issue.4, pp.366-375, 2008.

A. V. Banerjee and E. Duflo, Reputation Effects and the Limits of Contracting: A Study of the Indian Software Industry*, Quarterly Journal of Economics, vol.115, issue.3, pp.989-1018, 2000.
DOI : 10.1162/003355300554962

P. Bajari and S. Tadelis, Incentives versus Transaction Costs: A Theory of Procurement Contracts, The RAND Journal of Economics, vol.32, issue.3, pp.387-407, 2001.
DOI : 10.2307/2696361

B. Doshi, The new OGC guidance: The future roadmap for government IT procurement, Computer Law & Security Review, vol.21, issue.4, pp.344-348, 2005.
DOI : 10.1016/j.clsr.2005.06.006

M. Schiessl and S. Duda, A Qualitative Oriented Study About IT Procurement Processes: Comparison of 4 European Countries UI-HCII 2007, Held as Part of HCI International, Second International Conference on Usability and Internationalization, 2007.

B. Aschhoff and W. Sofka, Innovation on demand -Can public procurement drive market success of innovations? Research Policy, pp.1235-1247, 2009.

C. Okoli and S. D. Pawlowski, The Delphi method as a research tool: an example, design considerations and applications. Infomration & Management, pp.15-29, 2004.

R. C. Schmidt, Managing Delphi Surveys Using Nonparametric Statistical Techniques. Decision Sciences, pp.763-774, 1997.
DOI : 10.1111/j.1540-5915.1997.tb01330.x

D. Parnas, Designing Software for Ease of Extension and Contraction, IEEE Transactions on Software Engineering, vol.5, issue.2, pp.128-138, 1979.
DOI : 10.1109/TSE.1979.234169

J. Ward and E. Daniel, Benefits Management: Delivering Value from IS & IT Investments, 2006.
DOI : 10.1002/9781119208242

T. Päivärinta, W. Dertz, and L. Flak, Issues of Adopting Benefits Management Practices of IT Investments in Municipalities: A Delphi Study in Norway, 2007 40th Annual Hawaii International Conference on System Sciences (HICSS'07), 2007.
DOI : 10.1109/HICSS.2007.303

T. Päivärinta and W. Dertz, Pre-determinants of Implementing IT Benefits Management in Norwegian Municipalities: Cultivate the Context, Electronic Government -7th International Conference, pp.111-123, 2008.
DOI : 10.1007/978-3-540-85204-9_10