Usability [使用性]



  • 產品的一組屬性
    • ISO 9241-11: “[Usability refers to] 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.”
    • Jakob Nielsen(1993): 使用性並不是一種使用者介面的單一維度屬性。傳統上,使用性有五個不同屬性:可學性、效率、可記憶性、錯誤率、滿意度。
      It is important to realize that usability is not a single, one-dimensional property of a user interface. Usability has multiple components and is traditionally associated with these five usability attributes: learnability, efficiency, memorability, errors, satisfaction. - Jakob Nielsen, Usability Engineering, 1993, p. 26
  • 產品使用經驗的一種屬性
    • In general, usability refers to how well users can learn and use a product to achieve their goals and how satisfied they are with that process.
  • 產品好用/易用的程度
    • Janice (Ginny) Redish & Joseph Dumas(1999): Usability means that the people who use the product can do so quickly and easily to accomplish their own tasks. This definition rests on four points: (1) Usability means focusing on users; (2) people use products to be productive; (3) users are busy people trying to accomplish tasks; and (4) users decide when a product is easy to use. - Janice (Ginny) Redish and Joseph Dumas, A Practical Guide to Usability Testing, 1999, p. 4
    • Steve Krug(2000): After all, usability really just means that making sure that something works well: that a person of average (or even below average) ability and experience can use the thing - whether it's a Web site, a fighter jet, or a revolving door - for its intended purpose without getting hopelessly frustrated. - Steve Krug, Don't Make Me Think, 2000, p. 5
  • 一種設計方法
  • 混合定義
    • Whitney Quesenbery: Usability starts with a philosophy - a belief in designing to meet user needs and to focus on creating an excellent user experience - but it is the specific process and methodology that produce the real goal of usability. A new usability process starts by looking at who uses a product, understanding their goals and needs, and selecting the right techniques to answer the question, “How well does this product meet the usability requirements of our users?” - Whitney Quesenbery