The microcomputer has put a vast amount of computational power in the hands of the practicing chemical engineer. However, a microcomputer is of little use unless there are programs available to solve chemical engineer- ing problems; In this book, I have put together a collection of BASIC pro- grams that w ll help the practicing engineer be more productive and able to solve complex problems that are normally handled on mainframe com- puters. The plant engineer will find the book particularly useful. The plant en- gineer is calle upon to investigate problems that range from simple trouble shooting to tQe detailed design of complex chemical plants. The larger proj- ects are usually add-on jobs to the regular duties of keeping a chemical plant running. In t day's business climate, answers to problems must be obtained quickly and ccurately. The computer is capable of testing hypothesis, thereby allo ing engineers to evaluate alternative solutions to problems quickly and provide answers to management's questions that invariably shift like the sand in a desert.