Teaching load allocation, that is, which teaching staff teaches which subject, is an essential task that is carried out in all teaching and teaching/research institutions every year or every semester. Teaching load allocation has been well recognized as a major contributing factor to the teaching quality. The teaching load must be reallocated for changes of staff and/or program. As a consequence, teaching load has to be reallocated in each teaching unit at least once a year. We have interviewed 15 teaching units in 8 universities in Asia, Europe and Australia, and found that all the teaching units allocate teaching load manually in a trial-and-error manner. As a result, teaching load allocation is a timeconsuming process. Moreover, the manual allocation may lead to unfavourable results. For example, (i) some staff may have much more teaching load than they should, while other staff may have much less teaching load; and (ii) some staff members may have to teach subjects that they are not proficient with, and two staff may be favourable of exchanging two subjects between them.