This study contains data on conflict behavior among a selected sample of 1,557 nation dyads in the years 1950, 1955, 1960, 1963, and 1965. Originally collected by the Dimensionality of Nations (DON) Project at the University of Hawaii, these data provide information on the behavioral dimensions of the interactions between the nations in the dyads. The dyads represent all of the paired relationships for 113 nations. The conflict variables are coded for actor and target, date of conflict, and frequencies of occurrence. The violent action variable is coded only for the presence or absence of violent conflicts. Conflictual interactions are described through variables such as warning or defensive acts, number of wars, negative behavior, severance or suspension of diplomatic relations, expulsion or recall of diplomats, boycott of another country or embargo on commerce with another country, aid to subversive or rebellious groups of another country, negative communication, accusations, protests, unofficial acts of violence, and attacks on embassy of one nation by the other. Included also is one record each year for all non-conflict dyads. The variables are arranged by year, within year by actor and within actor by target.