ABSTRACT
This chapter presents five dimensions of usability, which can be used in several ways: As a model, they provide a way to understand what kind of usability is needed in different contexts; As a tool, they help guide the design process, suggesting both a general approach and specific choices; For evaluation, they are both useful as a way of understanding why a design is failing, and suggest appropriate techniques to get the design right. This multifaceted view of usability allows designers of both complex and simpler products to understand user requirements and evaluate the success of the design. The five dimensions of usability such as effective, efficient, engaging, error tolerant and easy to learn offers information designers a way to define user requirements in a way that can help analyze, design, and evaluate an interface. Finally the chapter looks at how this broad view of usability contributes to a successful product.
