Interest in large-scale, grammar-based parsing has recently seen a large increase, in response to the complexities of language-based application tasks such as speech-to-speech translation, and enabled by efforts in large-scale, collaborative grammar engineering and in the induction of statistical grammars/parsers from treebanks. Parser throughput is an important consideration in real-world applications, since throughput tends to degrade as grammar size increases. Investigation of efficient approaches to parsing is therefore an important topic of research.