A realistic assessment of the prospects of arms control must take into account the full range of "factors affecting the susceptibility of military instruments and activities to international regulation." What arms control theory presently lacks is the explicit and systematic analysis of these key factors, in general and applied to specific cases. This paper offers a typology of such factors, drawn from the existing body of arms control theory, and applies it to a concrete historical case— the Soviet-American Strategic Arms Limitation Talks of 1969-1972. It is hoped thereby to throw light on both the initiation and success of negotiations, and the specific form which agreements are likely to take—that is, the types of weapons systems or acti...