This is chapters 14 and 15 of Contemporary Calculus. Chapter 14 covers double and triple integrals in rectangular, polar, cylindrical and spherical coordinates and changes of variables in those systems. Chapter 15 covers vector calculus including vector fields, divergence curl, the del operator, line integrals and the theorems of Green, Stokes and Gauss. Besides technique practice and applications of the techniques, the examples and problem sets are also designed to help students develop a visual and conceptual understanding of the main ideas. This material has been reviewed and successfully class tested.