Designing user interface for Web interactive systems

The user interface design aims at enabling work and other activities to be performed more effectively, efficiently and with more enjoyment and satisfaction. The user interface of multiuser Web applications is a medium where all objects being shared on it can be viewed independently from the geographical location and its users can interact with each other in real time. Designing such an interface for users working collaboratively requires dealing with a number of issues. Herein, our concerns lies on the control component of human-computer interaction design and corresponding user interface (UI) software that implements it. Our interactive systems development process based on the MPX Mapping from PAN (Protagonist Action Notation) into Xchart (eXtended Statechart) is used to improve the product quality. Then, we illustrate this methodological approach through a case study of a Web interactive system