Generic term traversal operators support te definition of [[Generic term traversal]] strategies like =topdown= and =bottomup=. Operators available in Stratego are:

	* ==one== applies a strategy to one direct subterm.
	* ==some== applies a strategy to as much as possible, but a least one, direct subterms.
	* ==all== applies a strategy to all direct subterms of the subject term.

The generic term traversal operators are built-in: they are not defined in Stratego itself. It is however possible to define them in Stratego with even more primitive strategies.