The bed is comfortable and the environmental controls are set to optimal human levels.

What that optimal level should be, though - now that's a subject for a real national debate.

"Everyone has their own optimal level of arousal," he said.

These factors are used to determine the optimal level of health that an individual will demand.

Thus, there is an optimal level for a given organization with a specific culture.

For most substances presented, the optimal levels are the ones normally found in the population as well.

More specifically, optimal levels are generally close to a central tendency of the values found in the population.

This provides the correct incentives for individuals to work at their optimal level.

The goal is to keep the young athlete injury free and able to perform at optimal levels.

They apparently use this behavior to move to an optimal level in soil.