NARR Standard 3.0 NARR Standard 3.0 operationalizes the Social Model across four Domains, 10 Principles, 31 Standards and their individual rules. The Standard is tailored to each of NARR’s four levels. Version 3 of the NARR Standard does not introduce any operational rules that are not already included in Version 2. Rather, it restates them in a more logical way that improves clarity and eliminates some redundant language.