AS ISO 24495 plain language is now an Australian Standard. Use it as a governance lever.

AS ISO 24495.1:2024 is the most useful new lever a content lead in Australian government has had in years, and almost no agency has noticed. Standards Australia adopted the international plain language standard in 2024. Plain language is now a referenceable Australian Standard, citable in tenders, governance documents, and quality reviews, alongside WCAG and the Style Manual. That single change moves the conversation from "how I think you should write" to "the standard your agency has implicitly adopted."

In the work I led at ACT Government, the most consistent failure at clearance was not ignorance of plain language. It was that nobody at the table treated plain language as a compliance question. WCAG carried weight because it was a standard. Style preferences did not. AS ISO 24495 closes that gap.

What AS ISO 24495 actually requires

The standard sets four governing principles for plain language documents. Content must be relevant to what the reader actually needs. It must be findable. It must be understandable. And the reader must be able to use it. The four principles are interdependent. A document that fails on relevance is not rescued by being easy to read.

This is not a style guide. It is a definition of what makes a document plain. The full reference is AS ISO 24495.1:2024, the Australian adoption of ISO 24495-1:2023, Part 1: Governing principles and guidelines. Part 2, on legal communication, was published internationally as ISO 24495-2:2025. Part 3, on science writing, followed in May 2026. Australia has adopted only Part 1 so far.

The standard sits one level above the Style Manual. The Style Manual tells you how to write a date or a heading. AS ISO 24495 tells you whether the document, as a whole, is plain.

Why this matters in three governance contexts

The standard becomes a lever the moment you cite it in a document with consequences.

Tender responses and procurement specs. When you write a content design tender for an Australian government agency, naming AS ISO 24495 as the standard the work will meet shifts the negotiation. A competitor is not bidding against your craft. They are bidding against an Australian Standard. Most procurement teams will accept it without discussion because that is how they treat standards by default.

Content governance frameworks. In a governance framework, "all public-facing content meets AS ISO 24495.1:2024" reads differently to "all content should be in plain English." The first creates a compliance test. The second creates a debate at every clearance.

Quality reviews and audit findings. An audit finding that content "does not meet AS ISO 24495.1:2024 governing principles" is a finding an agency has to respond to. A finding that content "could be clearer" is feedback they can ignore.

A clause you can paste into a content governance framework

The shortest version that works:

All public-facing content published by [agency] must meet the principles of AS ISO 24495.1:2024 Plain language, Part 1: Governing principles and guidelines. Content owners self-assess against the four principles before publication. A quarterly content governance review samples published content against the standard.

Adapt to your governance maturity. The non-negotiables are: name the standard explicitly, attach an owner, and create a review point. Without those three, naming the standard is decorative.

What the standard does not do

It does not give you a readability score, and a Flesch-Kincaid number is not a substitute for it. It does not replace the Style Manual, which remains the operational reference for day-to-day writing. It does not replace user testing, because a document can meet the principles and still fail real users.

The standard is necessary, not sufficient. It also does not solve your clearance problem on its own. If senior approvers rewrite plain language back into bureaucratic prose, the standard gives you the language to push back, but the cultural work still has to happen.

The practical implication

If your content governance framework, content design brief, or tender response does not currently cite AS ISO 24495, it should. The standard exists. Your agency is already implicitly bound to follow Australian standards practice in other domains. Plain language is not exempt from that logic. It just hadn't caught up.

The question worth asking your governance lead this week: what other Australian Standards are referenced in our quality framework, and why is plain language not one of them?

Photo by Call Me Fred on Unsplash.