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After many years of hypertext research, the Dexter model was defined [7] to capture the features of most existing hypertext systems in a single, formal reference model. Likewise, the AHAM model [5] (based on Dexter) describes most features that are found in adaptive hypermedia systems (ahs). In the AHA! project funded by the NLnet Foundation we are extending the simple AHA system [4], [6] with the condition-action rules that were introduced in AHAM [8]. This results in a more versatile adaptation engine, with more intuitive and more powerful rules.

A prototype has been developed of a generic tool set and accompanying methods that enable a customizable approach towards project tracking and benchmarking. The underlying data model describes a generic project life cycle. The prototype has been applied to an iterative development life cycle in a number of field rests.

High level communication by means of the exchange of messages between different organizations or organizational units is studied. The concepts of business transaction and business transaction protocol are discussed. Message exchanges are controlled by a message handler that enforces a transaction protocol. The design and implementation of a generic message handler is described. The design is independent of a specific application. It offers a flexible implementation of protocols: dedicated subprocesses handle each message type. Changes in a protocol can easily be accommodated by adapting the subprocesses. A prototype has been written in the executable specification language ExSpect. The protocols can be validated by simulating the message exchange for a number of cases. As an application of the prototype, a party in a logistic chain using EDI is described.