Practical Formal Software Engineering is a textbook aimed at final year undergraduate and graduate students, emphasizing formal methods in solid writing code quickly. This book uses engineering approaches to illuminate the creation and verification of large software systems in which the theorems and axioms are intuited as a formalism realized through practice. Where other text books discuss business practices through a generic project management techniques or detailed system rigid logic, this book discusses the interaction between the code in the physical machine and logic that is applied in creating the software.