warning · Section 4: Sentences
Rule 4.4: Use connecting words and phrases to link related sentences
Use an approved connecting word (such as "and", "but", "then", "thus"), an approved connecting phrase (such as "as a result", "at the same time"), or a demonstrative adjective to link a sentence to the related idea in the sentence before it, giving descriptive text a logical structure and clarifying explanations that follow a work step or a safety instruction.
This rule needs human judgement. A checker can flag candidates; it cannot decide.
What a checker looks for
Usually a deviation, and context can excuse it.
- In descriptive text, flag a sentence that lacks a connecting word/phrase or demonstrative-adjective link to the related idea in the sentence before it, unless the logical relationship is already unmistakable from wording alone — the positive requirement is to use these links, not merely to avoid ambiguity.
- In procedures or safety instructions, flag an explanatory sentence that lacks a connecting word or demonstrative adjective linking it back to the preceding work step, warning, or caution, unless the link is already unmistakable.
- Flag connecting words or phrases that are not approved in the STE dictionary in place of a simple approved connector.
- (Detector heuristic, non-normative) When triage capacity is limited, prioritize cases where the missing link makes the relationship genuinely unclear over cases where it is merely stylistically absent — but do not use this as a reason to skip the rule's positive requirement entirely.
What this rule does not cover
- A short sequence of simple, self-explanatory imperative work steps does not need an explicit connecting word between every step.
- A related sentence whose logical relationship to the previous one is already obvious from context and wording is compliant without an explicit connector — connecting words/phrases are one method for showing a link, not a requirement on every adjacent pair.
How to fix it
Where the logical relationship between adjacent sentences is genuinely unclear, add an approved connecting word or phrase, or a demonstrative adjective, at the start of the dependent sentence to make it explicit.
Constraints on the fix
- Use only connecting words or phrases approved in the STE dictionary.
- Keep the linked sentences separate — do not merge them into a single sentence.
- Do not insert a connector into every adjacent sentence pair regardless of need.
Examples
Not STE: Tag the disassembled parts. It will help you during the subsequent procedures.
STE: Tag the disassembled parts. This method will help you during the subsequent procedures.
Not STE: When the hydraulic pressure is released, the sequence valve moves to the open position. The actuators are connected to the hydraulic return.
STE: When the hydraulic pressure is released, the sequence valve moves to the open position. As a result, the actuators are connected to the hydraulic return.
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.
- Testing AI systems
Sentence-length and structure rules are the part of the standard a script can check without a model. - LLM governance, operationally
Prompt, rule pack and model version are the assembly that determines the output. Governing the output means governing the assembly. - 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 4 - Sentences, page 1-4-7.
This page is commentary and does not reproduce the standard. About this rule pack.