We present a tool, CREWS, for generating applications in personnel scheduling in transportation companies. Systems based on CREWS have been developed for the Portuguese Railways, the Dutch Railways, the Norwegian Railways, and the West Anglia Great Northern Railway (one of the operators of the British Rail). The initial version of CREWS supported long-term scheduling of drivers and guards, but current developments are extending it to support short-term planning as well. CREWS heavily relies on the use of Artificial Intelligence techniques and has been built in the perspective of a "white box" system, in the sense that the planner can perceive what is going on, can interact with the system by proposing alternatives or querying decisions, and can adapt the behaviour of the system to changing circumstances. Scheduling can be done in automatic, semi-automatic or manual mode. CREWS has mechanisms for dealing with the constant changes that occur in input data, can identify the consequences of the change and guides the planner in accommodating the changes in the already built schedules (re-scheduling).
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