Reporting serves several purposes such as communication, record keeping, legal requirements, and measuring performance. There are various methods of reporting including written, graphic, and oral forms. Written reports can include formal financial statements, tables, charts, and accounting ratios. Oral reporting includes group meetings and conversations. Reports are also categorized by their intended users as internal or external, by their nature as enterprise, control, or investigative, and by timeframe as routine or special. Key types are financial reports and operating reports.