"This is the first and the only thesaurus on this subject constructed in India. This is a unique thesaurus and is constructed by adopting the blending of two approaches i.e.; a priori and posteriori approach. Further, the thesaurus is based on a specially constructed speciator based depth classification schedule of LIS terms. Apart from the thesaurus, the book also contains the depth classification schedule of LIS. It also explains in detail, the methodologies adopted in the construction of the depth classification schedule as well as the thesaurus of LIS terms."