  In the debate about galaxy correlation there are different questions which
can be addressed separately: Which are the statistical methods able to properly
detect scale invariance and describe, in general, the properties of irregular
and regular distributions? Which are the implications for cosmology of the
fractal behavior of galactic structures, up to a certain scale lambda_0? Which
is the homogeneity scale lambda_0, i.e. the scale beyond which galaxy
distribution has an eventual crossover to homogeneity? These are three
different, but related, problems, which must be considered in different steps,
from the point of view of data analysis as well as from the theoretical
perspective.
