In this paper we report the main results of a study on interoperability objectives and approaches in digital preservation (DP), conducted within the APARSEN Network of Excellence (NoE) 1 . The aim of the investigation was to collect interoperability challenges and goals from various initiatives and project partners and to produce a matrix of solutions and guidelines that can guide the stakeholders in DP to the multi-dimensional and complex landscape of digital preservation interoperability. The

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... paper describes the main findings of the research, including 1) an overview of the current projects and initiatives on interoperability in different areas of digital preservation, 2) an analysis of the main interoperability scenarios and challenges encountered by partners and other stakeholders in their daily life activity that served to drive the definition of the main common interoperability objectives for digital preservation, 3) a broad matrix of models, standards and services for interoperability that cover the main areas of digital preservation, which can be used as a working instrument to navigate the complex ecosystem of the current interoperability solutions, and 4) a list of recommendations and guidelines to create the ground for a coordinated and interoperable digital preservation ecosystem.