This paper reviews the underlying concepts and definitions of SNA and MPS in order to identify those areas where the differences in the content or classifications of the corresponding aggregates of these systems of national accounting can be eliminated or reduced in the course of the present or the future work on the revision of both SNA and MPS. This will bring the systems nearer to each other and improve international comparability of national income data. In cases where such a reconciliation is not feasible, the introduction of certain modifications or clarifications in the selected sections of SNA and/or MPS will be a useful step.Pursuing this objective, the paper introduces the following classification of the intersystem differences:—differences in the fundamental concepts and definitions;—differences caused by the peculiarities in the—institutional set up;—so called “incidental” differences.On examining the above classification the paper comes to the conclusion that each group requires its own approach. The second conclusion is that possibilities for reducing intersystem differences are more promising in the case of the third group.The paper uses the simplified MPS matrix in order to demonstrate the usefulness of certain modifications in the MPS classifications. These modifications do not imply any deviations from the fundamental concepts and yet they could facilitate international comparability.The paper also discusses certain modifications (or clarifications) concerning some aggregates which could be useful in the context of international