Is this word approved?
ASD-STE100 defines a controlled vocabulary: a set of approved words, each with an approved part of speech and an approved meaning, and a larger set of non-approved words each carrying the approved alternative to use instead. A live search over the extraction is the next phase of this section; what is here now is the provenance of the extraction and where its decisions surface on the rule pages.
How AI is used in this section
The rule pages and the published prompts are written and rendered from a structured rule pack; no model wrote them. The worked example on the prompts page is stored model output, reviewed once and kept with its errors showing. Nothing here runs a model on your text: you run the prompts against a model you choose, and what comes back is a set of candidate findings, each naming the rule it cites, for a person who knows the standard to accept or reject.
The ASD Simplified Technical English Maintenance Group does not endorse AI tools, this one included, and its June 2026 white paper on STE and AI(opens in a new tab) sets out its position: the standard takes priority, AI supports and does not replace a human author, and responsibility for the text stays with the person who signs it off. This section is built on that basis. Do not present any output derived from it as evidence that a document conforms to ASD-STE100.
ASD-STE100 is an international standard owned and published separately by the ASD Simplified Technical English Maintenance Group(opens in a new tab). Axiom Verity is not affiliated with ASD or the STEMG, and this site does not reproduce the standard. What is published here is a rule-by-rule commentary with our own examples, and a structured extraction of the controlled dictionary. If you need the standard itself, obtain it directly from ASD.
The dictionary extraction holds 2,037 entries against the 2,149 the standard declares, which is 94.8%. It was produced programmatically from the Issue 9 document and spot-checked rather than verified word by word. A word the checker cannot resolve is reported as needing review and is never passed silently.
Coming soon
A live, client-side search over the full dictionary extraction is planned for a later phase of this section. In the meantime, the 53 rule pages cite specific dictionary decisions inline, and three of the published prompts take a resolved word list as an input block.