I distinguish remote zones for the location of primary constituents that somehow agree with the finite head, and close zones for all other primary constituents. The head's internal structure determines the sequence of the zones. In a base, every element is located in a source location . In structures that are not bases, at least one element is not located in its source location but in a goal location . This element is then considered as having moved , and the whole structure as having derived from its base.
Parameters determine which constituents can take what kind of goal locations.
Parameters can be violated , and there is a degree to which violations constitute inacceptable structures. The idea of parameters and their violation has been adopted from Optimality Theory, and seems to be promising because it provides a softer approach to grammaticality since this property is now regarded as a continuum.