In recent years numerous approaches have been presented to support the acti
vities in chemical process design by means of software tools, but significa
nt improvements of the design process can only be achieved if it is support
ed in its entirety. Therefore, the integration of the existing software too
ls is of prime importance. All these tools are based on data models that ca
pture the information handled during the design process. In this study, a c
onceptual data model is presented that has been designed for the integratio
n of existing data models as a first step towards the integration of the so
ftware tools using these models. This conceptual lifecycle process model CL
iP is based on the ideas of general systems theory. This universal approach
renders the model very flexible and guarantees a well-defined structure fo
r data model integration. Some integration mechanisms are presented and dis
cussed. Finally, a conceptual model is proposed based on the architecture t
ool integration. (C) 2000 Elsevier Science Ltd. All rights reserved.