Documents under examination are referred to as questioned documents and can involve the analysis and comparison of questioned handwriting, typewriting, printing, papers, inks, photocopied documents and other documentary evidence. These documents can be in many different forms including letters, envelopes, currency, checks, passports, contracts and wills. In many cases, the questioned document is compared with materials of a known origin in an attempt to establish its authenticity or to detect any alterations. This chapter covers the collection and preservation of items associated with document analysis. It provides general information regarding selection and collection, covering various types of documents as well as more specific information, such as specimen samples for handwriting, counterfeit documents and damaged documents.