This Companion volume to Polymorphism: As It Is Played delves deeper into some of the ideas presented there. It also presents several additional case studies that are interesting in their own right, but might be employed in the Polymorphism Challenge. The Doctor presents a number of Big Ideas about software development. These Big Ideas of software development will aid you, as a student or instructor, to improve your skill dramatically. Explore parsing, simulation, simple games and more. While polymorphic coding is still a main focus, the ideas here will take you beyond. Joseph Bergin is a retired professor of Computer Science. He championed the teaching of modern programming paradigms, especially Object-Oriented Programming, throughout his career.