APARSEN has released the Report on Cost Parameters for Digital Repositories.
Here's an excerpt:
The purpose of this report is to present our analysis of published cost models. A review of cost parameters for the selected models focused on how cost parameters mapped to the International Standard for Trusted Repositories (ISO 16363) which enabled us to assess the areas of; Organisational Infrastructure, Digital Object Management and Infrastructure and Security Risk Management. The purpose was to assess whether cost models were measuring, through their parameters, the relevant activities for a trusted digital repository.