Does the Management Control Information (MCI) quality disclosure improve the relation with the shareholders? From accountancy regulatory bodies' expectations, the information qualities are more likely to be reached by MCI in its large scope. Besides, the agency, signal and stewardship theories provide elements to explain the information disclosure and the way to measure it. A qualitative study is conducted to find out a method to measure the quality. Based on a list of items to capture the levels of quality, three indexes are constructed, which validity is then tested on a 55 French listed companies' sample. Finally, interactions between MCI quality, its disclosure and its usefulness to the shareholders are revealed, and then confirmed on the same 55 firms sample by tests on market reactions. A positive impact of MCI quality disclosure appears, while volatility shows investors' uncertainty under lower quality disclosure.
