Taking into account the limits of such data, this study analyses the shifts in voting behaviour from the national elections in 1985 to those in 1987 in Flanders, using log-linear modelling. The use of data from poll surveys for estimating shifts between subsequent elections poses some methodological problems. The second part presents the results of the analysis. About 13,51 % of -the 1985-voters switched. Although there are significant shifts between all the political parties, the Christian Democratic Party (CVP) loses on all fronts. A log-linear analysis of party-reference by sex, age and occupational status shows the strength and weakness of each party in different societal categories. In conclusion, an interpretation of the shifts is proposed. The following factors can account for the major shifts: the desintegration of the catholic pillar, the emergence of a dual society, the affinity between neo-liberalism and yuppie-culture and the conflict between the language communities.