Islamic religious education is mandatory in public schools at all levels.

By the early 2000s, weight classes were introduced and became mandatory in many countries.

Americans spent an estimated $126 billion last year on car insurance, which is mandatory in all states.

H.261 is mandatory in any enhanced H.320 system with video capability.

On April 19, 1998, 660 became mandatory for all calls in the affected area.

These will be made mandatory in office buildings between 2006 and 2019.

The use of front seat belts is mandatory in Kuwait.

This should include the development of service standards that are mandatory in all Community airports.

Certification by a third body is now mandatory in all such cases.

This is pretty expensive, but for groups over 500, it's almost mandatory in our 1984esque world.