введены

введены

"Introduced" or "implemented."

Here, 'введены' is used in a passive voice construction to indicate that rules have been brought into use in the system.

В систему были введены новые правила.

New rules were introduced into the system.

In this case, 'введены' describes the action of introducing new objects into a certain space.

После ремонта в комнату были введены новые элементы декора.

New decor elements were introduced into the room after the renovation.

Here, 'введены' indicates the addition of new components to a predefined structure or system.

В программу обучения введены дополнительные курсы.

Additional courses were incorporated into the training program.