"The Variational Calculus with Engineering Applications was and is being taught to 4th year engineering students, in the Faculty of Applied Sciences, Mathematics - Informatics Department, from the University Politehnica of Bucharest, by Prof. Emeritus Dr. Constantin Udriste. Certain topics are taught at other faculties of our university, especially at master's or doctoral courses, being present in the papers that can be published in journals now categorized as "ISI". The Chapters were structured according to the importance, accessibility and impact of the theoretical notions able to outline a future specialist based on mathematical optimization tools. The probing and intermediate variants lasted for a number of sixteen years, leading to the selection of the most important manageable notions and reaching maturity through this variant that we decided to publish at Wiley. Now the topics of the book includes seven Chapters: Extrema of Dierentiable Functionals; Variational Principles; Optimal Models Based on Energies; Variational Integrators; Miscellaneous Topics; Extremals with Nonholonomic Constraints; Problems: Free and Constrained Extremals. To cover modern problem-solving methods, each Chapter includes Maple application topics."-- Provided by publisher.