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Definição de usabilidade da norma ISO 9241-11

1998
  • International Organization for Standardization (ISO)
Laboratório de testes de usabilidade com usuários que avaliam aplicativos de software na interação humano-computador.

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The international standard ISO 9241-11 defines usability as the “extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use.” This definition provides a estrutura for measuring usability by breaking it down into three distinct, quantifiable components, moving beyond purely subjective assessments.

The ISO 9241-11 standard, part of the broader ISO 9241 series on “Ergonomics of human-system interaction,” provided a crucial, formal definition that helped mature the field of usability engineering. Prior to its establishment, “usability” was often used loosely. This standard operationalized the concept into three measurable dimensions. ‘Effectiveness’ refers to the accuracy and completeness with which users achieve specified goals. For example, can a user successfully complete a purchase on an e-commerce site? ‘Efficiency’ relates to the resources expended in relation to the accuracy and completeness with which users achieve goals. This is often measured in terms of time taken or clicks required. ‘Satisfaction’ is the user’s subjective response—their freedom from discomfort and positive attitudes towards the use of the product. It is typically measured using post-test questionnaires. The definition also emphasizes the “specified context of use,” acknowledging that usability is not an absolute, intrinsic quality of a product but is dependent on the specific users, their goals, and the environment (physical, social, technical) in which they operate. This contextual element is critical, as a product highly usable for an expert in a controlled office environment might be unusable for a novice in a distracting, mobile setting. The standard’s framework guides practitioners in setting clear, testable usability goals and evaluating designs against them.

UNESCO Nomenclature: 1203
Ciência da Computação

Tipo

Sistema abstrato

Interrupção

Substancial

Uso

Uso generalizado

Precursores

  • The field of ergonomics and human factors, which studied human capabilities and limitations in relation to work environments and tools.
  • Early work in software psychology and human-computer interaction from the 1970s and 1980s.
  • Brian Shackel’s 1986 definition of usability, which included effectiveness, learnability, flexibility, and attitude.
  • The quality management movement (e.g., ISO 9000), which emphasized standardized, measurable definitions of quality.

Aplicações

  • development of usability testing metrics
  • standardized reporting in product evaluations
  • legal and contractual requirements for software procurement
  • integration into user-centered design processes
  • certification of product quality

Patentes:

NA

Ideias de Inovação Potencial

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Related to: usability, ISO 9241-11, effectiveness, efficiency, satisfaction, human-computer interaction, user-centered design, ergonomics, standard, context of use.

Contexto histórico

Definição de usabilidade da norma ISO 9241-11

1990
1990
1993
1998
2010
2016
1988-06-01
1990
1993
1997-04-23
2001
2010
2020

(Caso a data seja desconhecida ou irrelevante, por exemplo, "mecânica dos fluidos", é fornecida uma estimativa aproximada de seu surgimento notável)

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