The purpose of this study is to present solutions to expanding added-term relations which will fit new information retrieval environment. This report reviews standards for ISO 2788 and ANSI/NISO Z 39.19, and compares and analyzes 20 thesaurus added-term relations currently used to find out problems and limitations. Based on findings of the study, this report suggests how to expand thesaurus added-term relations to accomodate changes in information retrieval environment. In order to solve those problems, this report presents solutions to expanding added-term relationships as follows: First, definition was separated from scope note and scope note is categorized by type. Second, principles for the use of qualifiers are presented. Third, principles for expanding of descriptor term information are presented.