[Gamma et al.] has plenty to say about Factories, so why bother with treating them in this book? This is a simple chapter that does not attempt to reinvent the wheel. Rather, its focus is on understanding where Factories should exist. There are, of course, a few good tips to share about designing a worthy Factory in a DDD setting. See how the project team created Factories in their Core Domain as a way to simplify the client interface and protect the model’s consumers from introducing disastrous bugs into their multitenant environment.