This document discusses the process of compiling dictionaries. It begins by defining compilation as producing a list of words with meanings from various sources into a single reference work called a dictionary. It notes that lexicographers build upon the work of previous generations in determining headwords and information to include. Key aspects of compilation include selecting headwords, sourcing data from previous dictionaries, citation files, and computer corpora, and writing dictionary entries which may involve teams of specialists. The document also notes changes in the digital age allowing simultaneous work and improved accuracy.