G. Lakshmi Narasaiah is a mechanical engineering graduate from REC (now, renamed NIT), Warangal and specialized in Aero-structures during his post graduate study at Indian Institute of Technology, Kanpur, India.His work for over 25 years at Bharat Heavy Electricals Ltd, India on analysis of pressure vessels, boiler supporting structures, etc consolidated his theoretical concepts. After 25 years of service in industry, he choose teaching profession to share his experience with engineering students. He taught Engineering Mechanics, in addition to many other subjects, for many batches of engineering students in different colleges for over a decade. His teaching experience prompted him to author text books on 'Finite Element Analysis' and 'Aircraft Structures' about 10 years back, to fill the gaps in the existing books and students' needs. The success of these books with graduate engineers prompted him to write this third book for the benefit of first year students, with emphasis on explaining theoretical concepts and laying the right foundation for the other design subjects.