Whether enough commuters can be coaxed out of their cars to make the system a success remains to be seen.

And the ultimate success remains to be seen.

The success of this move (and of others) remains to be seen.

The success of their visible campaign remains to be seen.

The success of cellphone-based fund-raising for charity remains to be seen.

Thus far Andersen seems to have the field to itself, but the concept's success remains to be seen.

While the amnesty program is reaching more people than some critics had expected, its ultimate success remains to be seen.

The success of their efforts remains to be seen.

Their success remains to be seen; however, they offer a ray of hope for young professionals in the country who currently lack access to books.

The success of the mission to track down the medical center's high-tech, high-rise squatters remains to be seen.