warning · Section 9: Writing practices
Rule 9.4: Use consistent terminology and wording for the same item and the same type of work step
Once you choose a technical noun for an item, or a sentence style/wording for a recurring type of instruction, use that exact same term and wording every time that item or instruction type occurs in the text, rather than varying the phrasing for the sake of variety.
What a checker looks for
Usually a deviation, and context can excuse it.
- Flag different terms used for what is clearly the same item across the text (e.g. 'main body', 'body', and 'body assembly' all referring to the same part).
- Flag different wordings or sentence constructions used for what is functionally the same type of recurring work step or instruction (e.g. 'lubricate the bolts' and 'apply a small quantity of oil to the threads of the bolts' used interchangeably for the identical action).
- Flag inconsistent verb choice for the same recurring action across similar steps (e.g. 'torque' vs 'torque-tighten' used for the same tightening action).
What this rule does not cover
- Genuinely different items or different actions are allowed different wording — this rule applies only when the same item or the same type of instruction is being described more than once.
How to fix it
Pick one term for each item and one sentence style for each recurring type of work step, then apply that exact term or wording every time that item or work-step type recurs in the text.
Constraints on the fix
- Do not merge references to genuinely different items or different actions into the same wording just to force consistency.
Examples
Not STE: Put the housing (8) in its installation position on the main body (9). Lubricate the two bolts (10) with oil.
STE: Put the housing (8) in its installation position on the body assembly (9). Apply a small quantity of oil to the threads of the two bolts (10).
Not STE: Torque-tighten the two bolts to 4 Nm. ... Torque each of the four bolts (12) to 0.8 Nm.
STE: Torque each of the two bolts to 4 Nm. ... Torque each of the four bolts (12) to 0.8 Nm.
Related rules
Where this fits in AI governance
A rule a checker can test is a rule a model can be held to. The same discipline, on the governance side of this site.
- Prompt engineering
Writing practices are the closest thing the standard has to prompt guidance, and they were written for humans first. - LLM governance, operationally
The prompt is a governed artefact. This is what governing it looks like day to day. - Output validation guardrails
A controlled language is a checkable output constraint. This is the control that treats model output as something to be checked rather than trusted.
Source
ASD-STE100 Issue 9, Section 9 - Writing practices, page 1-9-8.
This page is commentary and does not reproduce the standard. About this rule pack.