Seven nanosafety projects have begun using the ERM identifier, a great start. Clearly, not all questions on how the identifier will be used in practice have been answered as yet. Indeed, during the initial dissemination of the identifier, a number of questions arose. For example, do we really need another identifier? The Registry does not bar the creation of identifiers for nanomaterials that already have an identifier, however the purpose is primarily to create identifiers for materials that did not yet have a unique identifier.