JavaServer Faces (JSF) is the technology that Sakai has chosen to represent and manage the user inferface of tools. JavaServer Faces was developed by Sun Microsystems as the successor to Struts. JavaServer Faces technology simplifies building user interfaces for JavaServer applications. Developers of various skill levels can quickly build web applications by: assembling reusable UI components in a page; connecting these components to an application data source; and wiring client-generated events to server-side event handlers.