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From the Preface:

Web accessibility is about removing those barriers so that people with disabilities can use and contribute to the Web.

This books helps you improve your products—websites, software, hardware, and consumer products—to remove accessibility barriers and avoid adding new barriers. One guiding principle is: just ask people with disabilities.

Accessibility in Design:

Accessibility basically means that people with disabilities can use a product. More specifically, accessibility is making user interfaces perceivable, operable, and understandable for people with a wide range of abilities. Accessibility also makes products more usable by people in a wide range of situations—circumstances, environments, and conditions.

Thus, while access to people with disabilities is the primary focus of accessibility, it also benefits people without disabilities, and organizations that develop accessible products. (for example, see "Additional Benefits from a Business Perspective")

Designing for accessibility doesn't require a whole new design process; it generally involves only minor adjustments to your existing design process. For example, accessible design techniques fit well into User-Centered Design (UCD) processes. This book tells you how to integrate accessibility throughout design.

Scope:

Most of the information throughout the book applies to all electronic and information technology (E&IT) products, including computer hardware products, software products, web-based products, and consumer products such as music players, cell/mobile phones, and digital cameras. Information that applies only to a specific type of product is indicated in the text.

The scope of this book is integrating accessibility throughout the design process. It doesn't include specific design solutions. It's not intended to replace training and experience in designing products to be accessible. It doesn't address legal compliance, or provide instructions on determining if a product conforms to a specific accessibility standard.

Instead, this book focuses on including people with disabilities from the beginning of design in order to develop effective accessibility solutions efficiently.