This book serves as an addition, hence En Plus, to the classic textbook Finite Element Procedures by the same author (now available in two volumes). This book covers the major developments in finite element methods during the last two decades, adding substantially to the material presented in the book Finite Element Procedures. The basic philosophy of this En Plus book is the same as for the Finite Element Procedures book. The En Plus shall not present a survey of recent developments but only focus on, quoting from the earlier Preface, “basic Finite Element Procedures, very useful in engineering and the sciences and that will probably be employed for many years to come”. This book serves as an essential resource for students and professionals, to enrich their knowledge of engineering analysis.