Yet the radio remains a very viable form, especially in the developing nations, because of its reach.

It is the only viable form of interstellar travel.

I want animated movies for adults to become viable form of entertainment in America.

The vehicle that carries the words is no longer an economically viable form of transportation.

It questioned the technique as a viable form of protest today.

"I've always thought that anarchy ought to be a viable form of society."

In other words, they see products and brands as viable forms of creative expression.

LightSail-1's goal is to test if solar sails are a viable form of space transport.

We have a safe, viable form of energy now.

For at the least its implied objective is a viable form of society which large numbers of people actually want.