Hypertext systems as popularly used on the Internet support the non-hierarchical structure. To support structured web sites like Yahoo, InfoSeek and Excite uses external databases to deliver the web pages. Interfaces Interfaces are an essential part of systems. The various components of the systems, such as operating units, processes and procedures, interface with each other. In an interface we have a source and target, a transformation and also an output and input.
Feedback loops are also very common in interfaces.
Systems and interfaces are part of our world and must be understood. Multiple relationships and hierarchies Information does not always fit into a single structure or hierarchies, but they can belong to multiple hierarchies. There can also be multiple relationships between the various pieces of information. We therefore not only need to know that two pieces of information are connected but also how they are connected. Multimedia Format Information is often stored in multimedia format today.