During the years 1977-1980 Dr. K.R. Tripathi was working in the Centre of Advanced Study in Sanskrit, University of Poona, as a Teacher fellow. During this period Dr. Tripathi had the opportunity to meet several scholars in the field of Sanskrit studies during the Seminars organized by the CASS. I mention especially the Seminar on Indian theories of Sentence-meaning held in 1979, and the Seminar on Aspects of Vedic Interpretations held in 1980. As a result of his study D Tripathi acquired the skills necessary for the interpretation of Panini. The first part of the present work deals with general prob lems of rule ordering in the Aradhyayi known to Dr. Tripathi from various sources. The main part of the work, however, is devoted to a study of the organization of the raddhita-section of the Ayadhyay, which formed the subject of the Ph. D. thesis of Dr. Tripathi for the University of Poona in 1980. Here Dr. Tripathi convincingly shows that the raddhita-section has been arranged along two different lines, namely, according to suffixes (the pratyayadhikára) and according to meaning-condi tions (the arthadhikara).