====== How do I code recursive system operations in DCI? ======
There is nothing special about recursion in general in DCI, it can be done where it's deemed useful. It's important to remember however, that [[can_a_role_be_played_by_several_different_objects_in_a_given_context_instantiation|Roles cannot be rebound during a System operation]] and its following Interaction.

If you do a recursion on a whole System operation though, it's common that you want to rebind Roles at the recursion point. There are a few ways of doing that:

  - Instantiate another Context at the recursion point, and call its System Operation
  - Call the atomic "Bind Roles" method right before calling the System Operation again.

The choice is implementation- and convention-based. If you bind Roles only in the constructor, the first option could be more convenient.

Multiple calls to the "Bind Roles" method may not be a good idea. See: [[Can I rebind roles to objects multiple times over the lifetime of a Context object?|Can I rebind roles to objects multiple times over the lifetime of a Context object?]]