Ok, I'm having trouble wrapping my head around your example. And I'm not sure if things are complicated by my particular situation because I rely on SUPER calls. Here's a simplified representation of the classes that have the relationships hard coded:

package Base ;

sub new {
  my $class = shift;
  bless {}, $class;
}

sub do {
  my $s = shift;
  print "hi Base here\n";
}

package One ;

use parent 'Base';

sub do {
  my $s = shift;
  $s->SUPER::do;
  print "hi from pkg one\n";
}


package Two ;

use parent 'One';

sub do {
  my $s = shift;
  $s->SUPER::do;
  print "hi from pkg two\n";
}

package Three ;

use parent 'Two';

sub do {
  my $s = shift;
  $s->SUPER::do;
  print "hi from pkg Three\n";
}
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And then in a script:

my $three = Three->new;
$three->do;
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hi Base here
hi from pkg one
hi from pkg two
hi from pkg Three
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OK, I think I see what you are saying. So essentially, my Base class does the following when the "do" method is called on it:

package Base;

use One;
use Two;
use Three;

sub do {
  print "hi from Base\n";
  Three::do;
  Two::do;
  One::do;
}
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And my config file would determine which order to run the subroutines from each of the packages. Is that right?

UPDATE: Here is a version of the code above that is a bit more dynamic:

package Base ;

use One;
use Two;
use Three;

sub new {
  my $class = shift;
  bless { steps => [ qw(Three Two One) ] }, $class;
}

sub do {
  my $s = shift;
  print "hi from Base\n";
  for my $step ( @{ $s->{steps} }  ) {
    $step->do;
  }
}
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So I think I got it from here. I just have to dynamically import the correct modules and populate the steps attribute with the config file during construction. Nice trick. Thanks!

Just a quick follow up to show a crude way of getting this done by passing the order of the classes into the base class:

package Base ;

sub new {
  my $class = shift;
  for my $mod (@_) {
    eval "require $mod";
  }
  bless { steps => \@_  }, $class;
}

sub do {
  my $s = shift;
  print "hi from Base\n";
  for my $step ( @{ $s->{steps} }  ) {
    $step->do;
  }
}
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Then call construct new from a script:

my $base = Base->new( qw ( One Three Two ) );
$base->do;
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