This paper traces the existing Accounting Systems in a selected Public Sector Undertakings (PSU), in Botswana and examines how far the systems are suitable for the New Public Sector Undertakings Management (NPSUM). It concludes that the current accounting systems such as financial accounting, cost accounting, management accounting and reporting systems are not suitable for the effective and efficient management. It is suggested to adopt an Integrated Accounting System (lAS), which is to be, developed to suit the needs of a specific PSU as each PSU is different in nature and a blanket system of accounting should not be applied.