This type of diversification is used mostly by small businesses because it is less risky. In the majority of cases it does not require big investments and owners feel more secure because they know the opportunities and threats in the field of their main business activities. However, sometimes this diversification does not bring the expected results and profits. Most often the reason for this is the underestimation of accompanying problems and the need of knowledge and skills in the field of change management, cultural differences, human resource management (layoffs, quitting, promoting, hiring) and so on. However, the reason for not meeting the results and expectations of the diversification may be the overestimation of the expected benefits and profits from the synergy, during the preliminary analysis.