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\end{quote}  This states that the number of communicative civilizations in our Galaxy is just the product of the chance of emergence of intelligent life times the average lifetime of a civilization's communicative phase. It seems hard to be able to put strong theoretical constraints on both these factors. However, one can turn the problem around, and in the \href{https://www.authorea.com/25815}{final post} of this series I will show how the current search for radio signals from extraterrestrial intelligence (\href{http://www.seti.org/}{SETI}) can be used to put some important constraints on the two factors $f_i$ and $L$, and how this information can be used to make bold predictions about the future of humankind.  Next: \href{https://www.authorea.com/25815}{The Fermi Paradox}  %\href{http://en.wikipedia.org/wiki/Fermi_paradox}{Fermi}  %\href{http://en.wikipedia.org/wiki/Rare_Earth_Hypothesis}{Rare Earth}