Foundations and Earth Structures is written primarily for an undergraduate course in foundation analysis and design. It should also appeal to graduate students and practicing engineers. There are three primary objectives for this textbook. Firstly, to present basic concepts and fundamental principles that are necessary to understand the background of the methods employed in foundation design. Secondly, to inform students on the values and limitations of popular methods of analyses in foundation engineering. Thirdly, to provide a framework for students to carry out simple foundation design and appreciate the design process. This is a textbook and t a design manual. Consequently, it emphasizes fundamentals rather than procedures. However, practical procedures, where appropriate, are included to allow students to transit into office design. The topics are sequenced so as t to rush the students into design but to build a solid foundation in the fundamentals so that they could understand the implications of the assumptions in the design.