The sixth edition of Data Abstraction and Problem Solving with C++: Walls & Mirrors welcomes Associate Professor Timothy Henry of the University of Rhode Island as a co-author with Frank Carrano. The 6th edition is a significant revision of the previous edition with these goals: to place greater emphasis on data abstraction as a problem solving tool; to emphasize C++ as an implementation tool; to reduce the interdependency of chapters to allow more flexibility for instructors; to demonstrate safe and secure programming practices, to add VideoNotes to include a transition guide from Python to C++