Since a buffet involves diners serving themselves, it has in the past been considered an informal form of dining, less formal than table service.

Traditionally, use of the informal form was limited for relatives, very close friends, and for children.

Psychological assessment may come in two forms: formal and informal.

The second and more informal form was known as gyōsho (running style).

Use of the informal form of address is now uncommon in modern speech.

It was regarded as an informal form of half dress.

In Turkish, there are two forms of salutations, formal and informal.

The Most Noble is a shorter more informal form of the following:

"I'll ring him, Chief," he replied, using the informal form of address for a warrant officer.

The services demonstrate an informal form of worshipping God freely.