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This brief aims to classify the MRV (Measuring or Monitoring, Reporting and Verification) system of GHG emissions/reductions according to its object, aim, methodology and implementation body to demonstrate that there are significant differences between each type of MRV system. It also suggests the need to develop of new type of MRV system for quantitative evaluation of NAMAs (Nationally Appropriate Mitigation Actions) which can be substantially different from other MRV types.