=over =item @ISA X<@ISA> Each package contains a special array called C<@ISA> which contains a list of that class's parent classes, if any. This array is simply a list of scalars, each of which is a string that corresponds to a package name. The array is examined when Perl does method resolution, which is covered in L. To load packages while adding them to C<@ISA>, see the L pragma. The discouraged L pragma does this as well, but should not be used except when compatibility with the discouraged L pragma is required. =back