Merging Web Accessibility and Usability by Patterns

Nowadays, usability and accessibility are two important qual-ity aspects of user interfaces (UIs). But in research and development, both are sometimes accounted as unity and sometimes as contradiction. Un-derstanding Web accessibility as an essential part of usability, here an approach is given to clarify the relationship of both. Therefore, – a pattern approach was chosen to meet the practical requirements of UI designers which are often not familiar with accessibility needs, – a collection of patterns for human-computer interaction (HCI) has been extended with accessibility requirements and – finally a pattern example illustrates the cooperation of usability and accessibility in detail.