Focused repetition leads to specialized domain knowledge, which leads to higher quality and efficiency. (siliconhillslawyer.com)
Shulman proposed a more specialized domain - specific knowledge that combined CK and PK as PCK, for example, how to create math word problems. (citejournal.org)
If you create technical documentation, this is probably not relevant, but developers who build EPUBs in multiple languages or for specialized domains will appreciate the ability to specify exact font data. (ibm.com)