EPCP has been the top selling introductory chemical engineering textbook in the United States almost since it first appeared in 1978.  The 4th edition of EPCP contains around 350 new and revised problems, particularly in biomedical, biomolecular, environmental, energy, materials, and safety applications. In addition, an entirely new suite of resources for students and instructors has been assembled, including a spreadsheet-based tool that eliminates much of the drudgery of routine calculations that require large expenditures of time and have little instructional value. A review of the third edition appeared in Chemical Engineering Education.