Notecards is a computer environment designed to help people work with ideas by providing a set of tools for a variety of specific activities, which can range from sketching on the back of an envelope to formally representing knowledge. The basic framework of this hypermedia system is a semantic network of electronic notecards connected by arbitrarily typed links. Four basic constructs are included in the system: notecards, links, browsers, and fileboxes. Notecards contain an arbitrary amount of information embodied in text, graphics, images, voice, or any other editable or presentable substance. Links are used to represent binary connections or relationships between cards. Browsers are cards that contain editable note-link diagrams showing the structure of some portion of the network. Fileboxes are cards that provide the user with a hierarchical filing structure for organizing collections of cards into topics or categories. The Notecards system was developed for, and runs with, the Xerox LISP environment and the Xerox 1100 workstation. In addition, Notecards can be integrated with other systems running in the LISP environment such as mail systems, databases, and rule-based expert systems. (2 references) (EW)