This paper describes a new approach to visualization of scenarios within the use case-based engineering of functional requirements-the so-called video camera metaphor. The video camera metaphor facilitates involvement of business people, customers, problem domain experts and other non-technical stakeholders into capturing and validating formal requirements models. The key tool, supporting the video camera metaphor is the so-called interface editor which allows to draft the prototype user interface and automatically generates a user-friendly front-end to the set of formal modelling tools. The essence of the video camera interface is to associate sequences of events on a UML sequence diagram or an ITU-T message sequence chart with sequences of activations of the elements of the generated user interface. The video camera interface allows capturing scenarios through direct activation of both the input and the output elements of the generated user interface. The generated user interface is also used to replay scenarios for validation purposes.

Building upon existing software systems while maintaining or improving software quality is a major goal of software engineering. To achieve this, every software engineering phase (requirements analysis, software design, implementation, testing and maintenance) must produce good quality outputs for the next phase. We believe that a next generation reverse engineering tool can assist in realizing this need. InSight is a new and powerful CASE toolset for software developers and architects, designed to support the development and maintenance of software throughout the complete lifecycle. The inSight tool suite provides software architects and developers with new capabilities of understanding existing software systems, allowing them to ask their day-to-day questions directly to the tool and receive up-to-date answers while interacting with the tool. It includes data mining capabilities such as code flow extraction, and software interaction extraction such as operating system and application specific messaging, uses, needs, etc. The inSight tool suite also includes powerful graphical interfaces for presenting and manipulating the extracted information. Control flow is presented as editable flowcharts. InSight supports Protel, ANSI C, and C++. InSight uses a patent pending reverse engineering technique to perform these extractions.