A2 - page 5 believed reasonable to make a limited amount of preparation for this type of testing so that it could proceed, if permitted, with minimal delay. 2. High altitude tests higher than 50 K which is the Limitation of detectability of the Geneva experts system: this form has some probability of being permitted in the future, which is much less than the probability of contained underground testing and that it is more probable that it will be undertaken from J! than EPG; no extensive preparations for these tests are felt to be warranted due to the low probability but the pessibility is sufficiently great that investigations and plans for this type of testing should be kept under continuous review. 3. Very small yield atmospheric tests at the NTS or elsewhere within the U.S.: such tests have very little probability of early resumption; any detailed planning or preparation is not warranted. 4. Atmospheric tests on or over the open sea or under water: this form of testing seems to have a slightly higher probability than atmospheric testing at EPG but still Little chance of being undertaken due to the general opposition to atmospheric testing; sufficient planning and investigation is warranted for these types of tests as necessary to prove phere feasibility and address the resources required to undertake them : should not be to the extent of making any substantial expenditure of funds or talent. 5. Atmospheric tests at EPG: Early resumption of this form of test even with Limited yields has an extremely small probability although the probability of such tests in the very long-range future is hard to determine especially if there were a severe break-down in relations with the Soviet Union; it is believed that the EPG should be placed on