At this point of time, there is no vocabulary control device in any form that can serve thernpurpose of depth-indexing of micro-documents. This study centers round the design andrndevelopment of an online alphabetical thesaurus of terms on "Islamic Law". It can be usedrnfor searching and retrieval of bibliographic references, as well as the profiles ofrnorganizations and institutions, projects and experts. A device which can serve the purposernof depth-indexing of micro-documents can at the same time serve the purpose of indexingrnmacro-documents. For the purpose of developing the alphabetical thesaurus, a systematicrnthesaurus has been developed first by using the faceted approach to the extent necessary andrnsufficient. In addition, the standard procedures for the construction of alphabetical thesaurusrnas prescribed by different authorities have been followed to the extent warranted. Arnthesaurus database containing records ofterms on "Islamic Law" has been developed. Thernstructure of the online version of the OECD macrothesaurus called "Thes" has been usedrnfor this purpose. For the purpose of online maintenance and use of the thesaurus anrnapplication programmer called "Theshi", an improved version of the "ThesProgram", thatrncomes with Micro CDSIISIS software, has been used. Necessary print and sort worksheetsrnhave been designed for generating the alphabetical thesaurus from the database . Thern"Vocon.Pas Program" , developed at SISA, has been used to demonstrate the use of thernthesaurus for indexing.