The main purpose of the article is to indicate the biggest problems and barriers of the internal market, their elimination being of crucial importance to the economic development of the European Union. On the basis of key documents and reports the current level of development of the internal market is analyzed. The author also presents an assessment of hitherto activity of EU institutions and member states in view of intensifying the development of a Uniform European Market. However, it should not be expected that within the six months of Polish presidency of EU Council it will be possible to eliminate the major barriers and “missing links” of UEM, since it is a long and highly complex process.