The distribution of the seats in European Parliament which is most probably to result from the European elections in Belgium, on June 10, 1979 is forecasted. The extrapolation is based on the results of the general elections for the House of Representatives, which took place on April 17, 1977 and December 17, 1978. The mode of allocation of seats among the different political formations is influenced not only by the options taken by the parties themselves, whether they form a coalition with a like-minded party or not,but also by some characteristics of the electoral systems. Alternative systems lead to a different distribution than the one that is most likely to come out.