The two volumes of a 'Lexicon of the Boece' are a sequel to, and a development of, 'A Lexical Concordance to the Works of Geoffrey Chaucer' in two volumes in five parts which were published in 2003-2004. The 'Lexicon' is the third and final milestone on al long road. Its goal is 'A Chaucer Dictionary'. The first milstone, 'A Complete Concordance to the Works of Geoffrey Chaucer' in ten volumes, appeared in 1991-1992. 'A Concordance to 'Boece' ' ist the sexth volume of the unlemmatized 'Complete Concordance'. Lexicon of the ‘Boece’, which is designed to function as both a concordance and a dictionary, is a systematic investigation into the lexical and grammatical items in Chaucer’s translation of Boethius’s De Consolatione Philosophae. The Lexicon gives ample references to Chaucer’s Latin and French sources.