1. Errors can occur during recording transactions, posting transactions, or both. Errors that affect only one side of a transaction or account are easier to rectify than two-sided errors. 2. Corrections are made by drawing lines through incorrect entries and inserting the right information, or by making correcting journal entries. Suspense accounts are used when trial balances do not match due to unidentified errors. 3. The timing of corrections depends on whether errors are identified before or after key financial statements are prepared. Individual accounts can be corrected before statements, while after requires netting corrections through profit/loss or balance sheet accounts.