“…Measurement strategies are not always consistent with conceptualization. For example, while most researchers locate the sources of movement activity in intrapsychic processes, the studies are divided between those which obtain aggregate data on RD (Aberle, 1966;Davies, 1962Davies, , 1969Feierabend et al, 1969;Geschwender, 1964;Gurr, 1969Gurr, , 1970 and those which use self-report data on individuals (Bowen et al, 1968;Crawford and Naditch, 1970;Geschwender and Singer, 1970;Grofman and Muller, 1973;Pinard, Kirk, and von Eschen, 1969;Searles and Williams, 1962;Sears and McConahay, 1970). Writers using the frustrationaggression framework might be expected to relate individual psychological tension to movement activity; yet researchers such as Gurr do not do so but instead infer RD from economic and political indicators.…”