On the other hand, the thesaurus-based method of <cite>Yarowsky (1992)</cite> may suffer from loss of information (since it is semi-class-based) as well as data sparseness (since H Classes used in Resnik (1992) are based on the WordNet taxonomy while classes of Brown et al. (1992) and Pereira et al. (1993) are derived from statistical data collected from corpora.