Each chapter in this book describes an industrial unit operation from three different perspectives. The first part of the chapter introduces the reader to the particular process, its characteristics, and those of the associated equipment. The second part briefly describes the traditional control strategies. The third part concentrates on maximizing the efficiency or productivity of the unit operation; in other words, it is devoted to the subject of optimization. This chapter is structured the same way, and the discussion therefore begins with a description of the boiler equipment and the boiling process.