We devised heuristic approaches for operator scheduling in manned Grou
ped Technology (GT) cells. The heuristic approach consists of (1) Cycl
e Switching Rules (CSR) to deal with production environments covering
a longer decision horizon, and (2) Dynamic Scheduling Rules (DSR) to d
eal with environments covering a shorter decision horizon. They differ
in information requirements and decision horizons. In simulation expe
riments, we show that there is a predictable trade-off between the qua
lity of the resulting schedule and the information content of heuristi
cs used.