Simplified Technical English (ASD-STE100)
ASD-STE100 Simplified Technical English is a controlled language for technical documentation. It pairs 53 writing rules with a dictionary of about 900 approved words, and reached Issue 9, an international standard, in January 2025.
The writing rules
A grouped summary of the ASD-STE100 Simplified Technical English writing rules — active voice, short sentences, one instruction per sentence, and consistent terminology — with the standard sentence-length guidance.
The controlled vocabulary
How ASD-STE100 limits writers to roughly 900 approved words, each with one meaning and one part of speech, and how technical nouns and technical verbs act as project-defined exceptions.