The disambiguation of the authors and the correct attribution of the research works are two fundamental points for those who want to carry out at various levels analysis on the scientific production of individual authors, research groups, departments, research bodies, universities, national systems, disciplinary areas. In everyday practice, anyone working in the field of research and evaluation realizes that the databases used as a reference (Web of Science, Scopus and Google Scholar), beyond the reliability, access methods and sources used, present underlying problems related to the recognition of the correct affiliation of a researcher, the proper form of the name (homonyms, allonyms, variant forms) or in the case of names written in different alphabets and characters. The adoption and use of the ORCID identifier will overcome these problems.