People take to the streets to demand a change in the rigid political system.

Edison justified this rigid system as a form of moral quality control.

And yet, rigid systems are celebrated more than a football coach's mental ability to fit plays around players.

But it was too difficult to combine his scientific work with the rigid system of astronaut training.

It was broken, and we should be wary of returning to such a rigid system.

They can become a rigid system for controlling students and teachers, but they need not be used in this way.

Planet and fleet were for the time being one rigid system.

New York City has a rigid bureaucratic system designed more than a century ago.

With no rigid system to which to abide, the players broke out and created.

Traditional Japanese homes were built within a rigid structural system.