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A project consists of a collection of activities. Each activity is described by:
a) duration, b) set of predecessor activities, c) set of resources or machines required.
There is a limited number of each resource/machine.
An activity cannot be started until:
1) all its predecessors have completed, and
2) resources/machines required are available.;
See also: Pritzker, A., L. Watters, and P. Wolfe(1969),"Multiproject Scheduling with Limited Resources: a Zero-One Programming Approach", Management Science, vol. 16, no. 1, Sept., pp. 93-108.;