$data = /some data read from file, perl object/;

$data = process_A( $data, @options );
$data = process_B( $data, @more_options );

##</code><code>##

$data = /some data read from file, perl object/;

$data = $data->process_A( @options );
$data = $data->process_B( @more_options );

##</code><code>##

# data type object at this point has no 'process_c' method.

use MyCode::ProcessC; 

# now it ought to..

$newdata = $data->process_c( @even_more_options );