What is Fusion?
Fusion is an object oriented analysis and design method developed by Hewlett Packard Laboratories. Like the more modern UML, Fusion combines a number of object-oriented approaches and diagrams.
Fusion contains an object model, a data dictionary, a life cycle model, an operation model, an interaction graph, a visibility graph, and an inheritance graph. Fusion notations were adopted from Booch's OOD, Rumbaugh's OMT, Class Responsibility Collaborator (CRC), and Formal Methods.

Fusion Diagrams
Since Fusion unifies a number of different methodologies, you can consult the original methods to create Fusion diagrams. Below each Fusion diagram is matched with its correlating object-oriented method.