Galina M. Alexandrova , University of Ottawa. Finding the right approach continues to be a matter of no little controversy. Capturing the core properties of FGDs, concepts of strictest c-command, which require fillers and their gaps to be immediately attached to the same projection line, arguably possess a high amount of naturalness or simplicity. This type of constraint is directly reflected by Linear Indexed Grammars and has been implemented in the minimalist extension condition on structure building. It is not properly understood, however, which devices of which systems capture less orderly patterns best.
Systems using slash-categories or similar techniques seem to run into considerable difficulty here.
Feature-lists integrated into a checking theory of movement may be considered one of various alternatives.