  This proceedings contains a review, followed by a more speculative
discussion. I review different coordinate choices on the 21-dimensional
parameter space of the seesaw, and which of these 21 quantities are observable.
In MSUGRA, there is a 1-1 correspondance between the parameters, and the
interactions of light (s)particles. However, not all of the 21 can be extracted
from data, so the answer to the title question is ``no''. How to parametrise
the remaining unknowns is confusing--different choices seem to give
contradictory results (for instance, to the question ``does the Baryon
Asymmetry depend on the CHOOZ angle?''). I speculate on possible resolutions of
the puzzle.
