The regulated aerospace specification was formerly called "AECMA Simplified English", because AECMA originally created the standard in the 1980s. In 2005, AECMA was subsumed by the Aerospace and Defence Industries Association of Europe (ASD), which renamed its specification to "ASD Simplified Technical English" or "STE". STE is defined by the specification "ASD-STE100", which is maintained by the Simplified Technical English Maintenance Group (STEMG). The specification contains a set of restrictions on the grammar and style of procedural and descriptive text. It also contains a dictionary of approx. 875 approved general words. Writers are given guidelines for adding technical names and technical verbs to their documentation.