Compared to an interview with Oprah, the openness of the PTBT leaves something to be desired. For a document of its kind, however, it's pretty honest about its concerns regarding radioactive contamination of the planet and the safety of its future.

In another way, the PTBT exhibits openness in its function and format. It's a more-the-merrier kind of situation because when it comes to nuclear weapons, you want to make sure everyone is on the same page. One rotten apple spoils the bunch, right?

The PTBT was written in such a way that any nation, even if it was barely considered a nation by all of the other nations of the world, could join. It's incredibly nondiscriminatory, especially for something written by the greatest capitalist, the greatest colonial, and the greatest communist powers of the world at the time.

As per usual, the language of the PTBT is very clear about its stance on who can join. Take, for example, the following lines from Article III:

This Treaty shall be open to all States for signature. Any State which does not sign this Treaty before its entry into force in accordance with paragraph 3 of this Article may accede to it at any time. (18-19)

It may as well read, "Hop aboard!"

Finally, the PTBT includes a planned openness, in that it leaves room for improvement, such as a total or comprehensive test ban treaty. This is made apparent in the following line:

It is understood in this connection that the provisions of this subparagraph are without prejudice to the conclusion of a Treaty resulting in the permanent banning of all nuclear test explosions, including all such explosions underground, the conclusion of which, as the Parties have stated in the Preamble to this Treaty, they seek to achieve. (9)

The PTBT want to hinder the development of nuclear weapons while at the same time not hindering the development of restrictions on nuclear weapons.