Nowadays, IT operations are required to run on a tight budget and under constant watch. Compliance, security and mobile innovation are making proper auditing of IT systems absolutely necessary. Knowing the most fundamental facts, like who changed what, when, and where, will save hours of troubleshooting, satisfy compliance needs, and secure the environment. This white paper shows a methodical approach to IT infrastructure auditing. That includes proper planning, estimation of time needed to implement an effective IT auditing solution, and critical resources.