This paper presents a general way to represent and manage computer based activity traces,
which allow human and computational agents to parse, process and assist users in their
complex and dynamic activities. To succeed, such a system has to provide mechanisms to
declare, evolve and improve the sufficient knowledge to observe, interpret and reason about
its observations of this environment. We propose unambiguous language capable of
expressing this knowledge, together with some precise and well understood way of …

If computer is going to become a new medium to think with and work, if we are going to be
able to interact and communicate in multiple modalities, an efficient and intuitive means of
supporting our use and interaction with computer must be developed. We specially need
ways of encoding mechanisms to support user interactions, involved in an activity inherently
temporal and dynamic, as web navigation and search, eLearning activity, etc. Such
mechanisms will allow human and computational agents to parse, process and assist users …