This section contains a set of recommendations surrounding good module and class design. Bear in mind that Puppet development is, in principle, just like any other type of software development, and we've learned over many years in software development, and especially at O&O software, that certain modular and class design principles make our development better. I also feel that part of our journey toward infrastructure as code is making our Puppet code just as well-designed, structured, and tested as any other application code.