Methods for collection and evaluation of comparable documents

Considerable attention is being paid to methods for gathering and evaluating comparable corpora, not only to improve Statistical Machine Translation (SMT) but for other applications as well, e.g. the extraction of paraphrases. The potential value of such corpora requires efficient and effective methods for gathering and evaluating them. Most of these methods have been tested in retrieving document pairs for well resourced languages, however there is a lack of work in areas of less popular (under resourced) languages, or domains. This chapter describes the work in developing methods for automatically gathering comparable corpora from the Web, specifically for under resourced languages. Different online sources are investigated and an evaluation method is developed to assess the quality of the retrieved documents.