The routes were operated at municipal level, thus the quality and concept varied greatly between regions.

A child's concept of death varies with age, and this must be taken into consideration.

The concept of rights varies with political orientation.

The concept and its significance vary widely among different cultures, primarily the Middle East.

Is it possible that human concepts of time can vary this much because of language and culture?

The concept of replacement migration may vary according to the study and depending on the context in which it applies.

The concept of 'data protection' varies between legal systems.

The concept of family varies from one Member State to another, and the same applies to age limits.

The concept of what are natural rights has varied throughout history.

The researchers also notice that the concept of "management transfer" varies among countries.