### 4. Concluding Remarks

We have a secure if still schematic standard model for
cosmology, and the prospect for considerable enlargement
from the application of the cosmological tests. The theoretical
basis for the tests was discovered seven decades ago.
A significant application likely will take a lot less than seven
more decades: the constraints in
Table 1 already are serious, if
debatable, and people know how to do better.

Application of the tests could yield a set of tightly constrained
values of the cosmological parameters and a clear
characterization of the primeval departure from homogeneity. If
so cosmology could divide at a fixed point, the situation at
*z* = 10^{15}, say, when the universe is well described by a
slightly perturbed Friedmann-Lemaître model. One branch of
research would analyze evolution from these initial conditions
to the present complex structure of the
universe. The other would search for the physics of the very
early universe that produced these initial conditions. But before
making any long-term
plans based on this scenario I would wait to see whether the
evidence really is that the early universe is simple enough to
allow such a division of labor.

I am grateful to the organizers for
the invitation to this stimulating meeting. The work
in this paper was supported in part by the USA National Science Foundation.