Because of these differences both with the rest of the Basque dialects and also with Standard Basque or Batua, and respecting their corresponding uses, the Euskaltzaindia has produced a Model for Written Biscayan (in Basque: "Bizkaieraren idatzizko ereduaren finkapenak"), a set of rules mainly focused on morphosyntax. The official use of the dialects of Euskera is regulated through Regulation 137 of the Euskaltzaindia, according to which the use of Batua should be limited to the fields of communication, administration and teaching.