The first improvements which we have planned are particularly due to the limited **data** basis for the estimation of probabilities of death and migration and expected number of births in each municipality. Even if we had the **data** for say 5 years, the variance on an average over the years would be very large for small municipalities. W e are now thinking of combining the municipalities into groups in order to obtain a larger **data** basis per region. We have not yet decided how we shall form these groups of municipalities, but a study concerning the dependency of migra tions on variables both of a demographic and of a non-demographic nature has been started.