Intellectual capital (IC) as well as disclosure of information on IC has in recent years gained importance. IC is the key issue in strengthening a firm’s competitive position and in achieving its objectives. The purpose of this study is to investigate some determinants of the disclosure of IC in annual reports. In particular the aim of this research is to analyse the internal mechanisms of corporate governance (board composition, role duality, ownership structure, auditor type and size of audit committee), which influence the intellectual capital disclosure in corporate annual reports for a sample of all listed Italian firms at 31st December 2010. It has been used a disclosure index as a dependent variable, (ICD), and the method used to measure it is content analysis.

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The purpose of this chapter is to analyze the level and the quality of voluntary disclosures of Intellectual Capital (IC) in the sustainability reports on a sample of Italian listed companies. The authors conducted an analysis of twelve sustainability reports for two years (2009-2010). These are related to six firms selected among the most capitalized 37 Italian listed companies. To investigate the “level of disclosure,” the authors identified the presence of IC information, while to evaluate the “IC quality,” they constructed a voluntary disclosure index based on content analysis. IC information disclosure is more likely present in sustainability reports of firms with a higher levels of application of the Global Reporting Initiative framework. The results confirm that the sustainability report can adequately represent the intellectual capital, especially in order to understand its role in the firm and the interaction with other variables present in the firm.