It requires repetition in order to penetrate the minds in the marketplace.

The original message had been crazy enough to require repetition.

You can vary the time and place later, but creating a habit requires repetition.

Connectionist theories propose that forming cognitive associations between simple pieces of information occur in a gradual process which requires repetition.

Training the body - whether to perform surgery, play baseball or do ballet - requires repetition.

It requires months of practice, and endless repetition.

"You strike me as too intelligent a man to require repetition."

There are also more elaborate related forms, like the sestina - which requires repetition of exact words in a complex pattern.

It requires repetition to achieve understanding.

Calculating daylight factors requires complex repetition of calculations and thus is general undertaken by a proprietary computer software product such as Radiance.