ABSTRACT

 This study investigates the effect of corporate governance as an internal control system oflisted firms in Nigeria, for period of 10 years from 2009 to 2018. The Study primarily employs the agency theory and the resource dependence theory to investigate the relationship between corporate governance as an internal control system (boards ofdirectors’ size, audit committees size and board of directors' independence). The beneficiary of this work will be the firms management, shareholders, government and students. Ex-post factor research design was adopted and the sources of data for this will be obtained from secondary sources (journals, articles, internet and the audited annual report ofthe company). The study population will cover two manufacturingfirms. Nestle Nigeria Pic and Nigeria bottling company (NBC), The method ofdata analysisfor this work will be ordinary least square method (simple regression) and data collected will be analyzed using SPSS 22 Version 23. The finding ofthe study states that there is a significant relation between the board size, board independence and audit committee size on firm performance. The study there by recommends that manufacturing firms should have an optimal audit committee and board size to enhance firms performance on firms and also ensure the strengthening internal control to strengthen the quality and independence ofthefirm