The fourth, final volume of the textbook "Programming: Introduction to the Profession" is devoted to a variety of programming paradigms; it deals with the C++ language, abstract data types, and object-oriented programming; languages such as Lisp, Scheme, Prologue and Hope, functional programming, lazy computing are described; Tcl language is considered as an illustration of the command-script approach. Ousterhout's dichotomy is discussed, as well as compilation and interpretation as paradigms of a special kind. For schoolchildren, students, teachers and anyone interested in programming.