The problem of handwriting identification, which is devoted to a number of articles opening this collection, which deals with issues of the medieval Russian manuscript book, is very topical. It attracts the scientific interests of specialists of various profiles: actually paleographers, textologists, historians of the art of a manuscript book and - more broadly - historians of medieval fiction. Interest in the issues of the methodology, as well as in the practice of identifying handwriting, determines the nature of the articles included in the collection.