The concept of Integrated Reporting (IR) is currently discussed as a new form of reporting for companies. IR should help to develop corporate reporting as well as improve the quality of available information by combining all key financial and non-financial performance indicators in one report, and communicating the interdependences between them. The International Integrated Reporting Council (IIRC) and the development of the <IR> Framework promote this new approach. Introductorily, this thesis illustrates the current state of empirical research and aims to explain the concept of IR. Furthermore, it gives an insight into the development, the benefits and the consequences of IR. Studies have revealed that often firm-specific determinants influence the implementation of IR and that there are positive economic consequences associated with it. The main part of this thesis is the presentation of a study on the implementation level of the content elements of the <IR> Framework based on Austrian listed companies. The study reveals that content elements such as ‘Organizational overview and external environment‘ and ‘Risks and opportunities are high, whereas ‘Outlook and ‘Strategy and resource allocation‘ are less considered in the annual business reports. Besides, an additional study analyses whether firm-specific determinants (company size, profitability, ownership structure, business sector) are associated with the implementation level of IR. The outcome shows that the determinants company size, profitability and ownership structure do not have an impact on the implementation level for financial firms. Contrarily, there is a positive association between the implementation level, the company size and the ownership structure for non-financial companies.