cost model done by ENSURE partners from Cranfield University:
(1) M Badawy, E Shehab, P Baguley, MD Wilson, "Towards a cost model for long term digital preservation", In Proc. 2012 ISPA/SCEA Joint International Conference: Assuring cost efficiency : global solution, Brussels, Belgium, 14-16 May 2012.
See http://epubs.stfc.ac.uk/bitstream/7711/Towards%20a%20Cost%20Model%20for%20Long%20Term%20Digital%20Preservation.pdf
(2) Pengfei Xue, Essam Shehab, Paul Baguley, Mohamed Badawy (Cranfield University), "Cost modeling for long-term digital preservation: Challenges and issues", Proceedings of the 9th International Conference on Manufacturing Research ICMR 2011, Glasgow Caledonian University, Glasgow Sep 2011, pp 187-192.
See http://www.academia.edu/1215797/COST_MODELLING_FOR_LONG-TERM_DIGITAL_PRESERVATION_CHALLENGES_AND_ISSUES