Mergers and acquisitions (M&A) are one of the most important phenomenonsinfluencing dynamics of the world economy growth. At the same time, big numberof acquisitions turns out to be unsuccessful which induces one to examine reasonsfor failures and factors having influence on success of M&A. In the articlean attempt to systematize researchersí and specialists-practitionersí opinions onfactors that play a key role in acquisition success was made, as complexity ofM&A processes causes that only actions resulting from reliable analysis, that areafterwards well planned and carried out may bring results expected by the entities.