The paper describes an experimental multi-agent system developed for and ai
med at a computer-supported project-oriented production planning. The syste
m is based on a heterogeneous hierarchy of agents of three types that refle
ct the managerial structure of the manufacturing enterprise. To improve the
system efficiency, a new formalism-called tri-base model-of the multi-agen
t internal communication/negotiation mechanism has been introduced. The tri
-base model that has been tested in an industrial environment is treated in
detail in the paper. (C) 2001 Elsevier Science Ltd. All rights reserved.