on the anvil
(idiomatic) In a state of discussion, formation, or preparation; not yet matured.
Freedom is hammered out on the anvil of discussion, dissent, and debate. Hubert Humphrey
I proffer the following ideas with a substantial degree of trepidation; I know very well that many of them are speculative and can be proved or disproved on the anvil of experiment. Carl Sagan
A family is a place where principles are hammered and honed on the anvil of everyday living. Charles Swindoll
It is a fantastic initiative by the ministry to develop Aakash Tablet, a mobile device that can be utilised by students anywhere. It was successfully tried out. The second and third versions have come out and the fourth version is on the anvil. M. M. Pallam Raju
Point thy tongue on the anvil of truth. Pindar