Research in the field of standardized building models began
some 30 years ago [6]. Since this time a number of models have
been developed. Several scheduling systems have been presented,
e.g., in GHOST [7], and Builder [8]. More recently, this research has
concentrated on integrating building models into the design phase
of construction projects and forwarding the product information
for further use via appropriate interfaces, for example scheduling
or cost estimation [9]. Most construction scheduling systems and
methods use the Critical Path Method (CPM) or the Project Evaluation
and Review Technique (PERT) for plan analysis. These techniques
support the documentation of construction schedules but
not their generation. Furthermore, they are poorly suited for distributed
coordination of project participants. Some suggestions
for the securing of schedule information among all participants
are put forward in [10].