  We demonstrate how one may identify or constrain possible violation of $CP$,
$T$ and $CPT$ symmetries in the $K^0$-$\bar{K^0}$ system in a way as
phenomenological and comprehensive as possibie. For this purpose, we first
introduce parameters which represent violation of these symmetries in mixing
parameters and decay amplitudes in a well-defined way. After discussing some
characteristics of these parameters, we derive formulae which relate them to
the experimentally measured quantities. We then carry out a numerical analysis
with the help of the Bell-Steinberger relation to derive constraints to these
violating parameters from available experimental data. Finally, we compare our
parametrization and procedure of analysis with those employed in the recent
literature.
