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Prior studies show that the degree of internal audit effectiveness tends to vary with country-and organisation-level dynamics in an internal audit environment. The antecedents of internal audit effectiveness appear not fully explored as yet. This study, based on institutional theory, is aimed at investigating the relationship of internal audit effectiveness with two organisational attributes, i.e. organisational category and organisational size. To this end, a postal survey and an online survey were conducted among internal auditors in Poland. The research results show that although internal audit effectiveness does not significantly differ between public sector and private sector organisations, larger organisations in private sector have established more effective internal audit departments than their counterparts in smaller organisations. However, in the public sector the size of organisations is not related to internal audit effectiveness.

The paper reports the major results of a study of performance measurement of internal auditing in various organizations operating in Poland in 2013 and prospects for development. The research implies that many internal audit departments formally do not measure performance, while others do measure, but only informally. Many times satisfaction indicators of key internal audit stakeholders are not identified, the information on performance is not reported to anyone apart from the internal audit staff, and the information is not used for continues improvement. The most often used performance measures in practice are focused on measuring effectiveness of audit processes and impact of internal audit services on organizations' performance. In addition there are internal audit efficiency and output measured. Quality measures are less common. Stakeholders, scope and usage of performance measurement are related to various organizational characteristics. Many respondents have declared that in future will start and formalize performance measurement and based on it they will improve internal audit performance. In future performance measurement will be more focused on internal audit quality and value added.