1) Numeric records management systems arrange records based on numbers for easy expansion and confidentiality. It requires an index to locate records.
2) Consecutive numbering systems assign numbers sequentially without interruption. Numbered guides and folders are used to store and retrieve records along with an accession log and alphabetic index.
3) Nonconsecutive numbering systems like terminal-digit, middle-digit, and chronological storage assign numbers in different groupings or by date for alternative storage and retrieval methods.