Operational risk is a prominent preoccupation of all managers these days. Indeed, the development of collective awareness has led executives to implement a wide variety of solutions in order to keep this risk and its consequences under control. In this context, we propose a practical implementation methodology of key risk indicators system with the aim to identify operational risks and above all to propose preventive and corrective measures capable of monitoring and managing operational risks. The proposed system will be adjusted to Investment Management process in a Moroccan Asset Management Company.