Plain Language Standards for How-To Procedures
Plain language standards define how procedural writing should be structured, worded, and tested so that readers can act on it correctly the first time. The scope covers everything from federal agency guidance to classroom handouts — anywhere a written procedure exists, these standards offer a framework for making it work. The stakes are real: a procedure written at a 12th-grade reading level will consistently fail readers whose functional literacy sits at a 6th-grade level, and in high-stakes environments like healthcare or emergency response, that gap has consequences.
Definition and scope
Plain language, as defined by the Plain Language Action and Information Network (PLAIN), is communication that its audience can find, understand, and use. The legal foundation in the United States is the Plain Writing Act of 2010, which requires federal agencies to write all covered documents — including procedural instructions — in plain language (Plain Writing Act of 2010, Pub. L. 111-274).
For how-to procedures specifically, plain language standards address three distinct layers:
- Linguistic clarity — word choice, sentence length, active voice, and reading level
- Structural clarity — logical sequencing, numbered steps, and consistent formatting
- Navigational clarity — headings, white space, and the ability to scan before committing to reading
The scope extends beyond federal documents. The Center for Plain Language evaluates private-sector and nonprofit communication, and the International Plain Language Federation maintains a cross-national definition that aligns with ISO 24495-1, published in 2023 as the first international plain language standard.
A fuller treatment of how plain language fits within the broader landscape of procedural writing appears on the Plain Language in How-To Procedures page.
How it works
The core mechanism of plain language standards is a match between the document's complexity and the audience's capacity. PLAIN's federal guidance identifies sentence length as one of the most measurable levers: the target is typically 20 words or fewer per sentence for instructional content. Passive voice constructions are flagged for revision because they obscure who does what — exactly the information a procedure needs to convey.
The testing side is equally structured. The Federal Plain Language Guidelines recommend usability testing with actual members of the target audience — not editors or specialized references — before a procedure is finalized. A reader who can correctly complete a task after one pass through the procedure is the functional benchmark.
Reading grade level is measured using formulas like the Flesch-Kincaid Grade Level, which scores text based on average sentence length and average syllables per word. Federal health agencies, including the Centers for Disease Control and Prevention, recommend writing patient-facing procedural materials at or below a 6th-grade reading level. The CDC's health literacy resources note that approximately 1 in 2 American adults read at or below an 8th-grade level, making this threshold a practical standard rather than an aspirational one.
The elements of an effective how-to procedure — numbered steps, action verbs, and consistent terminology — are the structural toolkit that makes plain language operational, not merely stylistic.
Common scenarios
Plain language standards surface as a practical concern in predictable places:
- Healthcare instructions — discharge paperwork, medication guides, and post-procedure care sheets. The Agency for Healthcare Research and Quality (AHRQ) publishes health literacy tools specifically addressing procedural instructions for patients.
- Government forms and processes — tax filing instructions, benefit applications, and agency how-to guides covered directly by the Plain Writing Act of 2010.
- Workplace safety procedures — OSHA's Training Requirements in OSHA Standards (OSHA 2254) implicitly requires that safety training materials, including procedures, be comprehensible to the workers who will use them.
- Educational settings — K-12 classroom procedures, assignment instructions, and procedural writing as a literacy skill in English Language Arts curricula.
The contrast between public-sector and private-sector application is worth noting: federal agencies have a legal obligation to comply with the Plain Writing Act, while private organizations adopt plain language as a quality or liability risk management practice. The outcome standard is the same; the enforcement mechanism differs.
Decision boundaries
Not every procedural document requires the same plain language treatment. The critical distinction is between expert audiences and general audiences. A maintenance procedure written for certified aviation mechanics — regulated under FAA Advisory Circular AC 43-9C — can use field-specific terminology that would be impenetrable to a general reader, because the audience brings pre-existing domain knowledge.
The decision framework PLAIN recommends begins with audience analysis: identify the primary reader, their likely education level, their familiarity with the subject, and the conditions under which they'll read the document (stressed, rushed, at a workstation, on a phone). Those factors determine the appropriate reading level, the density of technical terminology, and the need for visual aids.
A second boundary involves scope: plain language standards apply to the instructions themselves, not necessarily to the technical content those instructions describe. A procedure for configuring network security software can describe a complex technical task — the plain language obligation is to describe the steps in clear, sequential prose, not to simplify the task itself.
For a broader orientation to procedural documentation and where these standards fit within the field, the howtoprocedures.com reference covers the foundational framework that plain language standards support.