Because knowledge organization (KO) is a broader and more abstract context for topic maps (TMs), before reading on, make sure you have acquainted yourself with the basic topic map concepts and technology as presented in this book (for example, Chapters 2, 6 and 14) so that you understand the core concepts of TMs and have worked through some examples.
I recommend that you read through the following parts of this chapter first:
The beginning of this section, through to the end of the KO, Knowledge Structures, and TMs subsection
The entire subsection, Some Definitions: What Is and Does KO? To What End KO?
The example in the Key Ingredients of KO Theory ...