Abstract

Designing architectures for interactive systems is difficult: Many
system failures are due to the inability to handle social and
technical changes that occur during development.

We introduce two architectural patterns for interactive systems. We
applied these to a long-term and short-term development project. In
the Dragon project, the graphical user interface evolved significantly
over a period of almost two years. In the Webvise project, the
conceptual model was modified to handle various extensions and meet an
emerging standard.

The application of these two architectural patterns demonstrates how focusing on
change, or more specifically on architectural uncertainty, can be
crucial to the success of a project.