Vaccine mandates and non-mandatory strategies are the subject of ongoing research and controversies.

It is therefore mandatory for cyclists to use both the mandatory and non-mandatory cycle tracks.

So I wouldn't want to get hung up on whether education is mandatory or non-mandatory.

The availability of non-mandatory diversity training is not enough.

Model one: assisted employee choice Employees choose a super fund themselves from a non-mandatory shortlist of four to 10 high-quality funds.