FEM - Lecture Notes: The book discusses FEM as subject of interest mainly to B.E./B.Tech.(Aeronautical & Aerospace), and partly to B.E./B.Tech.(Civil & Mechanical) degree students. The book introduces first the most accepted FEM concepts, next Elements (discrete, continuum and isoparametric) and finally FEM Problems to heat transfer and solid mechanics. The book is divided into three chapters (Extracts, Elements and Examples). This book is intended mainly to serve as a textbook for B.E./B.Tech.(Aeronautical Engineering) and as reference book for B.E./B.Tech.(Mechanical, Civil, Aerospace Engineering). This book covers all topics for FEM in B.E.(Aeronautical Engineering). Again to say, It is my hope that book will become an invaluable source of essential information for academic, industrial, and governmental researchers working in aeronautical engineering, mechanical engineering, civil engineering, aerospace engineering, computational methods and others interested in FEM and modelling.