Many sectors can use custom software. there's also lots of scope for software to help plan or schedule or optimise business decisions in large orgs. e.g. sched

Many sectors can use custom software. there's also lots of scope for software to help plan or schedule or optimise business decisions in large orgs. e.g. scheduling & routing trains, packing traffic onto ships, scheduling staff for shifts, optimising mixes of input ingredients to produce outputs of sufficient quality while maximizing profit