  We discuss a Curie-Weiss model with two groups with different coupling
constants within and between groups. For the total magnetisations in each
group, we show bivariate laws of large numbers and a central limit theorem
which is valid in the high temperature regime. In the critical regime, the
total magnetisation normalised by $N^{3/4}$ converges to a non-trivial
distribution which is not Gaussian, just as in the single-group Curie-Weiss
model. Finally, we prove a kind of a `law of large numbers' in the low
temperature regime, more precisely we prove that the empirical magnetisation
converges in distribution to a mixture of two Dirac measures.
