The paper presents a formal description of the resource allocation problem for resource-constrained project scheduling. A schedule
can be executed by various resource flow networks which may differ in terms of resistance to disruptions occurring during project execution.
The authors define such criteria of evaluating a resource flow network which can be more useful than robustness metrics used so far in
the research. The authors discuss the importance of robust scheduling for execution projects and propose metrics for resource allocation
robustness which take into consideration the stability of the final schedule. Those metrics make it possible to carry out a more precise
analysis concerning the properties of the resource flow network in terms of its robustness to disruptions in comparison with a well known
flexibility indicator, flex.