Simplified English is the original name of a controlled language historically developed for aerospace industry maintenance manuals. It offers a carefully limited and standardized subset of English. It is now officially known under its trademarked name as Simplified Technical English (STE). Although STE is regulated for use in the aerospace and defense industries, other industries have used it as a basis for developing their own controlled English standards.
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Proponents claim that Simplified Technical English can:
The Simplified Technical English specification consists of two Parts--Part 1: Writing Rules and Part 2: Dictionary. The Writing Rules specify restrictions on grammar and style usage. For example, they require writers to:
The dictionary includes entries of both approved and unapproved words. The approved words can only be used in their specified meaning. For example, the word "close" can only be used in one of two meanings:
The verb can be used to express "close a door" or "close a circuit", but it cannot be used in other senses (for example "to close the meeting" or "to close a business"). The adjective "close" appears in the Dictionary as an unapproved word with the suggested approved alternative "near". So STE does not allow "do not go close to the landing gear", but it does allow "do not go near the landing gear". In addition to the basic STE vocabulary listed in the Dictionary, Section 1, Words, gives explicit guidelines for adding technical terms and verbs that writers need to describe maintenance procedures. For example, words such as "overhead panel", "grease", "propeller", "to ream", and "to drill" are not listed in the Dictionary, but they qualify as approved terms under the guidelines listed in Part 1, Section 1 (specifically, Writing Rules 1.5 and 1.10).
Simplified English is sometimes used as a generic term for a controlled language. The aerospace and defense standard started as an industry-regulated writing standard for aerospace maintenance documentation, but has become mandatory for an increasing number of military land and sea vehicle programs as well. Although it was not intended for use as a general writing standard, it has been successfully adopted by other industries and for a wide range of document types. The US government’s Plain English[1] lacks the strict vocabulary restrictions of the aerospace standard, but it represents an attempt at a more general writing standard.
The regulated aerospace standard used to be called AECMA Simplified English, because the European Association of Aerospace Manufacturers (AECMA) originally created the standard in the 1980s. The AECMA standard originally came from Fokker, which had based their standard on earlier controlled languages, especially Caterpillar Fundamental English. In 2005, AECMA was subsumed by the Aerospace and Defence Industries Association of Europe (ASD), which renamed its standard 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).[2] 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. STE is mandated by several commercial and military specifications that control the style and content of maintenance documentation, most notably ASD S1000D.
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