We decided we would instigate a rigid schedule.

It's a rigid schedule, but it seems to give her freedom and a zest for life.

To maintain the rigid schedule, 157 relay stations were located from 5to 25 apart as the terrain would allow for.

With her unique view of the world, she depends on her very ordered existence, a rigid schedule that keeps her own track.

Formerly, the light had a rigid schedule of being lit one hour prior to sunset, and extinguished one hour after sunrise.