D.H. Rouvray, Preface. L.A. Zadeh, Foreword. D.H. Rouvray, The Treatment of Uncertainty in the Physical Sciences. G.J. Klir, From Classical Mathematics to Fuzzy Mathematics. K. Mislow, Fuzzy Restrictions and Inherent Uncertainties in Chirality Studies. A. Amann, Fuzzy Classical Structures in Genuine Quantum Systems. P.G. Mezey, Fuzzy Measures of Molecular Shape and Size. J. Brickmann, Linguistic Variables in the Molecular Recognition Problem. J. Xu, The Use of Fuzzy Graphs in Chemical Structure Research. I.P. Bangov, Fuzzy Logic in Computer-Aided Structure Elucidation. D. Dumitrescu, Fuzzy Hierarchical Classification Methods in Analytical Chemistry. Subject Index.