Historically assessment of Microbiologically Influenced Corrosion (MIC) in the oil and gas industry has focused on sulfate-reducing bacteria (SRB) using cultivation-based techniques. Today the use of molecular microbiological methods (MMM) for investigation of troublesome microbes provides improved accuracy and timeliness of results. While microorganisms abound in nearly every oil and gas production environment determining their role in internal corrosion and identifying appropriate corrosion management strategies requires a consistent and methodical approach. Since microorganisms can influence corrosion in different ways MIC diagnostics using MMM must be done in consideration of other factors that support corrosion such as operating history the presence of scale and deposits fluid composition and mitigation history.The corrosion management process is based on the assessment of corrosion threats; the identification of mitigation or barriers to those threats; and monitoring of barrier effectiveness. MIC diagnostics can be incorporated within these fundamental corrosion management processes; improving the operator’s ability to manage MIC threats. In this paper several case studies are used to illustrate the use of MIC diagnostics in the context of supporting a corrosion management program. The paper also discusses the implementation and applicability of the newly published NACE standard TM0212-2012 for operating companies.Key Words: Practical Case stories Oil and Gas MIC Diagnostics MMM Mitigation Corrosion Management NACE TM0212-2012