  We analyze the relaxation time of a ferromagnetic d dimensional growth model
on the lattice. The model is characterized by d param- eters which represent
the activation energies of a site, depending on the number of occupied nearest
neighbours. This model is a natural generalisation of the model studied by
Dehghanpour and Schonmann [DS97a], where the activation energy of a site with
more than two occupied neighbours is zero.
