ISO 24751 wiki

Search the space:


Child pages
  • New Version of 24751 Part 1

Versions Compared


  • This line was added.
  • This line was removed.
  • Formatting was changed.


ISO/IEC 24751 is intended to facilitate the matching of individual user needs and preferences with digital resources that meet those needs and preferences. This matching might involve finding a suitable resource or interface, or format of a resource, or it might involve adaptation of the resource or its interface. It is intended to address mismatches between personal needs and preferences caused by any number of circumstances, including requirements related to client devices, environments, language proficiency or abilities. The terms and definitions within ISO/IEC 24751 are not medical or judgmental but functional; the purpose is not to point out flaws in  in digital resources with respect to accessibility and adaptability, but to facilitate the discovery and use of the most appropriate content and interface components for each user. 

In ISO/IEC 24751, it is recognized that users experience a disability when there is a mismatch between the user's needs (or preferences) and the perceptual experience delivered. Disability is therefore not viewed as a personal trait but as a consequence of the relationship between a user, the situation in which they are working,   and an interactive environment or resource delivery system. An individual who is blind is not disabled when a resource is delivered in audio, but an individual who does not have the necessary background knowledge to understand the resource, or an individual who is listening to the resource in a noisy environment, is disabled. Given this re-framing, a resource is accessible when a user's needs can be addressed or matched (through adaptation, re-aggregation or substitution of digital learning interfaces or resources). Accessibility, in practice, is determined by the flexibility of the environment (with respect to presentation, control methods, structure, access mode, and intellectual supports, for example) and the availability of adequate alternative-but-equivalent interfaces, content and activities. The needs and preferences of a user may arise from the user's context or environment, the technical requirements of the user's device, the tools available (e.g. assistive technologies such as Braille devices, voice recognition systems, alternative keyboards, etc.), the user's background, or a disability in the traditional medical sense. Accessible ‘systems’ adjust the user interface or configuration of the interactive environment, and locate needed resources, matched and adjusted to the needs and preferences of the individual user.


Figure 2 “Matching Process diagram” illustrates a possible process for matching a digital resource to a user's needs and preferences represented as an UML process diagram.

 6 Specification of MLR data elements  6.1 Introduction A primary principle of this part of ISO/IEC 19788 is that a common set of attributes specifies the essential characteristics of each data element. This clause 6, specification of data elements, defines the attributes of data elements and rules for the values of those attributes. 6.2 Data element specification attributes The identification of data elements must be documented completely. This process is independent of how information system developers and implementers structure their database(s), (e.g., as learning resource repositories, as micro formats…). This is achieved through the use of data element specifications.  ISO/IEC FDIS 19788-1:2010(E) A data element specification consists of an identifier (for the data element specification) and a (defined) list of data element attributes with rules for the values of those attributes. Each data element specification has the following attributes: • Identifier (data element specification identifier) • Property name (data element name) • Definition (data element definition) • Linguistic indicator (data element linguistic indicator) • Domain (data element domain) • Range (data element range) • Content value rules • Refines • Example(s) • Note(s)

7 Multilinguality

Editors' note: how this is handled in the registry etc needs to be clarified here....


8 Conformance

This document is a framework document and as such there is no conformance to this part of the standard. Requirements for conformance are specified in successive parts of this standard. 


Assistive technologies in a specific class are conformant when they respond to the generic elements of ISO/IEC 24751 that apply to that class (e.g., screen readers would respond to screen reader elements). Editors’ note: this notion of ‘generic’ has to be sorted.

  1.  TNOTE ISO/IEC 24751 focuses on individuals and their needs and preferences from an accessibility perspective.d