  We have observed 1 event consistent with the signature expected of the rare
decay of a positive kaon to a positive pion and a neutrino anti-neutrino pair.
In the examined momentum region of 211 to 230 MeV/c in the center of mass of
the kaon we estimated the backgrounds to be about $0.08 \pm 0.03$ events. From
this observation we estimate the branching ratio to be $4.2^{+9.7}_{-3.5}
\times 10^{-10}$. In this presentation I will explain the experiment, and the
analysis techniques. I will also discuss the expected improvements in the near
future from the analysis of new data sets.
