"This workbook was born of the hand-outs I prepared for a seminar held in 2017. The demand for training in Descriptive Bibliography has always been high among students of bibliography and librarians, and recently I thought that perhaps a practical guide on how to write a collation might prove useful. The aim of this workbook is to gather together information which is scattered among manuals of bibliography and journal articles and to present it in a didactic fashion"--Introduction, page 7.