This document discusses accounting systems, including manual and computerized systems. It defines an accounting system as the methods and procedures used to collect, classify, summarize, and report financial information. A manual system is described as using journals, subsidiary ledgers, and general ledgers to record transactions. Transactions are first recorded in special journals, then posted to subsidiary ledgers which are controlled by a general ledger account. The document provides an example of recording revenue transactions in a revenue journal to illustrate the journalizing and posting process in a manual system.