  We present computational approaches as alternatives to the recent microwave
cavity experiment by S. Sridhar and A. Kudrolli (Phys. Rev. Lett. {\bf 72},
2175 (1994)) on iso-spectral cavities built from triangles. A straightforward
proof of iso-spectrality is given based on the mode matching method. Our
results show that the experiment is accurate to 0.3% for the first 25 states.
The level statistics resemble those of GOE when the integrable part of the
spectrum is removed.
