This chapter opens Part II of the book, which discusses the PBE Patterns and Guidelines.1 The PBE Patterns and Guidelines are to be used in conjunction with the PBE Core Values introduced in Chapter 1 and the PBE Practice discussed in Chapter 8 and Appendix F.
Why patterns and guidelines? PBE includes a set of patterns that have surfaced over the years. It makes sense to discuss patterns that can help us follow PBE; think of them as metapatterns. Also, it is important to see that new patterns are discovered and created; we are not restricted to using patterns that have been discovered by others. Patterns are for everyone—we all need to be on the lookout for pattern opportunities.