This corpus was created by Kirsten Ackermann and David Tugwell, using data available on the web and components from existing corpora, in a collaboration between Pearson Language Tests (part of Pearson PLC) and Lexical Computing Ltd. to create a large, balanced corpus of the language that non-native speakers of English need in order to thrive at English-language universities around the globe.
First version: 2009. The corpus was launched at IATEFL 2009. A full report is in preparation. A programme of additions and improvements over a number of years is anticipated.
It was part-of-speech tagged and lemmatized using English TreeTagger. Word sketches were prepared by David Tugwell, as used for other corpora in Sketch Engine.