This book aims to present to first and second year graduate students a beautiful and relatively accessible field of mathematics-the theory of singu- larities of stable differentiable mappings. The study of stable singularities is based on the now classical theories of Hassler Whitney, who determined the generic singularities (or lack of them) of Rn Rm (m 2n - 1) and R2 R2, and Marston Morse, for mappings who studied these singularities for Rn R. It...