The report gives a broad definition of IDRIS, listing requirements for qualification as IDRIS and possible additional features. Different organisational forms exist with or without legal identity, but a key point is that IDRIS should have clear added value. The OECD reports provide relevant information for IDRIS, summarising issues on road mapping and single-sited large international research infrastructures that may also be applicable to IDRIS. Often, only parts of these entities (as opposed to entire entities) collectively constitute the infrastructure. The agreement need not necessarily define a new legal entity, or be legally binding.