ISO 9241-304:2008

Overview

ISO 9241-304:2008 - "Ergonomics of human‑system interaction - Part 304: User performance test methods for electronic visual displays" provides guidance for assessing the visual ergonomics of display technologies using user performance test methods rather than purely optical laboratory tests. The standard focuses on measuring how well real users can read and process text on displays (alphanumeric and non‑alphanumeric) within a specific context of use. It covers only visual attributes of displays and does not address the overall product ergonomics or usability.

Key topics and requirements

• User‑centred test approach: Emphasises measuring user performance (speed, accuracy) and perceived quality (visual comfort) rather than isolated optical characteristics.
• Four‑step test process:
  • Specify visual ergonomics test objectives.
  • Define the test procedure.
  • Carry out the test with representative users and tasks.
  • Analyse the data using appropriate statistical methods.
• Conformance criteria: When comparing a test display to a benchmark, conformance requires that:
  • Search speed for the test display is not statistically significantly lower than the benchmark, and
  • Perceived quality (visual comfort rating) is not statistically significantly lower than the benchmark.
• Scope of tasks: The formal test method in Clause 8 applies to text handling and processing tasks; other content types (maps, photographs, moving images) are noted for future development.
• Statistical treatment: Test designs must include unbiased, objective measures and appropriate statistical analysis (the document references procedures such as Barnard’s U test and treatment of dependent measures).
• Test components: Guidance covers participant selection, test displays, test setup, dependent measures and data analysis - assuming users have background knowledge in behavioural science.

Applications and who uses it

• Primary users: Procurement specialists, product developers, ergonomists and human factors practitioners who need to assess or certify the visual ergonomics of displays.
• Applicable products: Desktop and portable computer monitors, mobile phone screens, digital camera displays, PDAs, in‑car navigation panels, consumer electronics status displays (e.g., printers, microwaves) and other electronic visual displays.
• Practical value: Use ISO 9241-304:2008 to validate display readability, ensure minimum visual ergonomics for a given context of use, and compare novel display technologies to benchmark displays when optical test standards are not available.

Related standards

• ISO 9241-302: Terminology for electronic visual displays
• ISO 9241-303: Requirements for electronic visual displays
• ISO 9241-305: Optical laboratory test methods for electronic visual displays
• ISO 9241-307: Analysis and compliance test methods for electronic visual displays
• ISO 9241 series (general ergonomics of human‑system interaction)

Keywords: ISO 9241-304:2008, visual ergonomics, user performance test methods, electronic visual displays, display testing, benchmark display, visual comfort, search speed.