The Nordic Product Registers has since 2003 been working on harmonizing the reporting process for companies in the Nordic countries. The objective of this report is to clarify the technical solution needed to accommodate the harmonization. This report describes a software model for implementing a joint reporting tool for the Nordic Product Registers. There exist various methods for implementing a solution to afford this, but the conclusion in this report is that a new client based on the fat-client paradigm should be developed. The report also contains cost estimates for the development and proposes two development plans for implementation.